21115530261120 has 128 divisors (see below), whose sum is σ = 71264914741440. Its totient is φ = 5299584057344.

The previous prime is 21115530261113. The next prime is 21115530261181. The reversal of 21115530261120 is 2116203551112.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323428302 + ... + 323493581.

Almost surely, 2^{21115530261120} is an apocalyptic number.

21115530261120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115530261120 is an abundant number, since it is smaller than the sum of its proper divisors (50149384480320).

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

21115530261120 is a wasteful number, since it uses less digits than its factorization.

21115530261120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646921922 (or 646921910 counting only the distinct ones).

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

The spelling of 21115530261120 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, two hundred sixty-one thousand, one hundred twenty".