21677427640 has 64 divisors (see below), whose sum is σ = 53224335360. Its totient is φ = 7880315520.

The previous prime is 21677427613. The next prime is 21677427671. The reversal of 21677427640 is 4672477612.

It is a congruent 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, 2169937 + ... + 2179903.

It is an arithmetic number, because the mean of its divisors is an integer number (831630240).

Almost surely, 2^21677427640 is an apocalyptic number.

21677427640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21677427640 is an abundant number, since it is smaller than the sum of its proper divisors (31546907720).

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

21677427640 is a wasteful number, since it uses less digits than its factorization.

21677427640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14932 (or 14928 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 46.

The spelling of 21677427640 in words is "twenty-one billion, six hundred seventy-seven million, four hundred twenty-seven thousand, six hundred forty".