21274720434 has 24 divisors (see below), whose sum is σ = 50285703312. Its totient is φ = 6446884920.

The previous prime is 21274720427. The next prime is 21274720483. The reversal of 21274720434 is 43402747212.

21274720434 is a `hidden beast` number, since 212 + 7 + 4 + 7 + 2 + 0 + 434 = 666.

It is a super-2 number, since 2×21274720434² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53723844 + ... + 53724239.

It is an arithmetic number, because the mean of its divisors is an integer number (2095237638).

Almost surely, 2^21274720434 is an apocalyptic number.

21274720434 is an abundant number, since it is smaller than the sum of its proper divisors (29010982878).

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

21274720434 is a wasteful number, since it uses less digits than its factorization.

21274720434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107448102 (or 107448099 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The spelling of 21274720434 in words is "twenty-one billion, two hundred seventy-four million, seven hundred twenty thousand, four hundred thirty-four".