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1202121101 = 9817122453
BaseRepresentation
bin100011110100110…
…1110100110001101
310002210000002010202
41013221232212031
54430220333401
6315141343245
741534601146
oct10751564615
93083002122
101202121101
11567625415
12296707b25
13162087a7c
14b5922acd
157080906b
hex47a6e98d

1202121101 has 4 divisors (see below), whose sum is σ = 1202253372. Its totient is φ = 1201988832.

The previous prime is 1202121071. The next prime is 1202121103. The reversal of 1202121101 is 1011212021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1011212021 = 6431572647.

It can be written as a sum of positive squares in 2 ways, for example, as 981568900 + 220552201 = 31330^2 + 14851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202121101 - 222 = 1197926797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202121103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51410 + ... + 71043.

It is an arithmetic number, because the mean of its divisors is an integer number (300563343).

Almost surely, 21202121101 is an apocalyptic number.

It is an amenable number.

1202121101 is a deficient number, since it is larger than the sum of its proper divisors (132271).

1202121101 is an equidigital number, since it uses as much as digits as its factorization.

1202121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132270.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1202121101 is about 34671.6180903055. The cubic root of 1202121101 is about 1063.2843134626.

Adding to 1202121101 its reverse (1011212021), we get a palindrome (2213333122).

The spelling of 1202121101 in words is "one billion, two hundred two million, one hundred twenty-one thousand, one hundred one".

Divisors: 1 9817 122453 1202121101