121235656370057 has 4 divisors (see below), whose sum is σ = 121547316155460. Its totient is φ = 120923996584656.

The previous prime is 121235656370021. The next prime is 121235656370077. The reversal of 121235656370057 is 750073656532121.

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 76298757527056 + 44936898843001 = 8734916^2 + 6703499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121235656370057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121235656369990 and 121235656370008.

It is not an unprimeable number, because it can be changed into a prime (121235656370077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155829892118 + ... + 155829892895.

It is an arithmetic number, because the mean of its divisors is an integer number (30386829038865).

Almost surely, 2^{121235656370057} is an apocalyptic number.

It is an amenable number.

121235656370057 is a deficient number, since it is larger than the sum of its proper divisors (311659785403).

121235656370057 is an equidigital number, since it uses as much as digits as its factorization.

121235656370057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311659785402.

The product of its (nonzero) digits is 7938000, while the sum is 53.

The spelling of 121235656370057 in words is "one hundred twenty-one trillion, two hundred thirty-five billion, six hundred fifty-six million, three hundred seventy thousand, fifty-seven".