21255541415562 has 32 divisors (see below), whose sum is σ = 42858999774720. Its totient is φ = 7027371373680.

The previous prime is 21255541415527. The next prime is 21255541415699. The reversal of 21255541415562 is 26551414555212.

It is a happy number.

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, 21651862 + ... + 22612257.

It is an arithmetic number, because the mean of its divisors is an integer number (1339343742960).

Almost surely, 2^{21255541415562} is an apocalyptic number.

21255541415562 is an abundant number, since it is smaller than the sum of its proper divisors (21603458359158).

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

21255541415562 is a wasteful number, since it uses less digits than its factorization.

21255541415562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44264778.

The product of its digits is 2400000, while the sum is 48.

The spelling of 21255541415562 in words is "twenty-one trillion, two hundred fifty-five billion, five hundred forty-one million, four hundred fifteen thousand, five hundred sixty-two".