Search a number
BaseRepresentation
bin100011110101000…
…0010011000001001
310002210011012021111
41013222002120021
54430230431441
6315143210321
741535356311
oct10752023011
93083135244
101202202121
1156768027a
122967469a1
131620b5903
14b5944441
1570823081
hex47a82609

1202202121 has 4 divisors (see below), whose sum is σ = 1215710100. Its totient is φ = 1188694144.

The previous prime is 1202202101. The next prime is 1202202137. The reversal of 1202202121 is 1212022021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 402443721 + 799758400 = 20061^2 + 28280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202202121 - 213 = 1202193929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1202202101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6753856 + ... + 6754033.

It is an arithmetic number, because the mean of its divisors is an integer number (303927525).

Almost surely, 21202202121 is an apocalyptic number.

It is an amenable number.

1202202121 is a deficient number, since it is larger than the sum of its proper divisors (13507979).

1202202121 is an equidigital number, since it uses as much as digits as its factorization.

1202202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13507978.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1202202121 is about 34672.7864614311. The cubic root of 1202202121 is about 1063.3082005068.

Adding to 1202202121 its reverse (1212022021), we get a palindrome (2414224142).

The spelling of 1202202121 in words is "one billion, two hundred two million, two hundred two thousand, one hundred twenty-one".

Divisors: 1 89 13507889 1202202121