21405472274670 has 64 divisors (see below), whose sum is σ = 58993071932160. Its totient is φ = 4916089324800.

The previous prime is 21405472274653. The next prime is 21405472274717. The reversal of 21405472274670 is 7647227450412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1706969191 + ... + 1706981730.

It is an arithmetic number, because the mean of its divisors is an integer number (921766748940).

Almost surely, 2^{21405472274670} is an apocalyptic number.

21405472274670 is an abundant number, since it is smaller than the sum of its proper divisors (37587599657490).

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

21405472274670 is a wasteful number, since it uses less digits than its factorization.

21405472274670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413950961.

The product of its (nonzero) digits is 5268480, while the sum is 51.

The spelling of 21405472274670 in words is "twenty-one trillion, four hundred five billion, four hundred seventy-two million, two hundred seventy-four thousand, six hundred seventy".