21256101115230 has 64 divisors (see below), whose sum is σ = 51238492600320. Its totient is φ = 5643431049984.

The previous prime is 21256101115177. The next prime is 21256101115237. The reversal of 21256101115230 is 3251110165212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256101115237) 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 31 ways as a sum of consecutive naturals, for example, 35314962 + ... + 35911818.

It is an arithmetic number, because the mean of its divisors is an integer number (800601446880).

Almost surely, 2^{21256101115230} is an apocalyptic number.

21256101115230 is an abundant number, since it is smaller than the sum of its proper divisors (29982391485090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21256101115230 is a wasteful number, since it uses less digits than its factorization.

21256101115230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602073.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 21256101115230 in words is "twenty-one trillion, two hundred fifty-six billion, one hundred one million, one hundred fifteen thousand, two hundred thirty".