235256415921 has 6 divisors (see below), whose sum is σ = 339814823010. Its totient is φ = 156837610608.

The previous prime is 235256415869. The next prime is 235256415943. The reversal of 235256415921 is 129514652532.

235256415921 is a `hidden beast` number, since 2 + 3 + 5 + 2 + 56 + 4 + 1 + 592 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 201453754896 + 33802661025 = 448836^2 + 183855^2 .

It is a de Polignac number, because none of the positive numbers 2^k-235256415921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (235256415721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13069800876 + ... + 13069800893.

It is an arithmetic number, because the mean of its divisors is an integer number (56635803835).

Almost surely, 2^235256415921 is an apocalyptic number.

It is an amenable number.

235256415921 is a deficient number, since it is larger than the sum of its proper divisors (104558407089).

235256415921 is a wasteful number, since it uses less digits than its factorization.

235256415921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26139601775 (or 26139601772 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 235256415921 in words is "two hundred thirty-five billion, two hundred fifty-six million, four hundred fifteen thousand, nine hundred twenty-one".