21113484434256 has 20 divisors (see below), whose sum is σ = 54543168121952. Its totient is φ = 7037828144736.

The previous prime is 21113484434233. The next prime is 21113484434269. The reversal of 21113484434256 is 65243448431112.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 439864259047 = 21113484434256 / (2 + 1 + 1 + 1 + 3 + 4 + 8 + 4 + 4 + 3 + 4 + 2 + 5 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219932129476 + ... + 219932129571.

Almost surely, 2^{21113484434256} is an apocalyptic number.

It is an amenable number.

21113484434256 is an abundant number, since it is smaller than the sum of its proper divisors (33429683687696).

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

21113484434256 is a wasteful number, since it uses less digits than its factorization.

21113484434256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439864259058 (or 439864259052 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 48.

The spelling of 21113484434256 in words is "twenty-one trillion, one hundred thirteen billion, four hundred eighty-four million, four hundred thirty-four thousand, two hundred fifty-six".