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1202012121 = 3400670707
BaseRepresentation
bin100011110100101…
…0011111111011001
310002202210112122110
41013221103333121
54430203341441
6315135142533
741533635342
oct10751237731
93082715573
101202012121
11567560552
12296674a49
1316204a29b
14b58d50c9
15707d6b16
hex47a53fd9

1202012121 has 4 divisors (see below), whose sum is σ = 1602682832. Its totient is φ = 801341412.

The previous prime is 1202012117. The next prime is 1202012159. The reversal of 1202012121 is 1212102021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1202012121 - 22 = 1202012117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1202012097 and 1202012106.

It is not an unprimeable number, because it can be changed into a prime (1202012101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200335351 + ... + 200335356.

It is an arithmetic number, because the mean of its divisors is an integer number (400670708).

Almost surely, 21202012121 is an apocalyptic number.

It is an amenable number.

1202012121 is a deficient number, since it is larger than the sum of its proper divisors (400670711).

1202012121 is an equidigital number, since it uses as much as digits as its factorization.

1202012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400670710.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1202012121 is about 34670.0464522331. The cubic root of 1202012121 is about 1063.2521813071.

Adding to 1202012121 its reverse (1212102021), we get a palindrome (2414114142).

The spelling of 1202012121 in words is "one billion, two hundred two million, twelve thousand, one hundred twenty-one".

Divisors: 1 3 400670707 1202012121