21277459424 has 24 divisors (see below), whose sum is σ = 45112306680. Its totient is φ = 9820365696.

The previous prime is 21277459393. The next prime is 21277459433. The reversal of 21277459424 is 42495477212.

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, 25573454 + ... + 25574285.

It is an arithmetic number, because the mean of its divisors is an integer number (1879679445).

Almost surely, 2^21277459424 is an apocalyptic number.

It is an amenable number.

21277459424 is an abundant number, since it is smaller than the sum of its proper divisors (23834847256).

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

21277459424 is a wasteful number, since it uses less digits than its factorization.

21277459424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51147762 (or 51147754 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 47.

The spelling of 21277459424 in words is "twenty-one billion, two hundred seventy-seven million, four hundred fifty-nine thousand, four hundred twenty-four".