21489913588 has 144 divisors (see below), whose sum is σ = 48052134144. Its totient is φ = 8303493120.

The previous prime is 21489913561. The next prime is 21489913603. The reversal of 21489913588 is 88531998412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5939556 + ... + 5943172.

It is an arithmetic number, because the mean of its divisors is an integer number (333695376).

Almost surely, 2^21489913588 is an apocalyptic number.

It is an amenable number.

21489913588 is an abundant number, since it is smaller than the sum of its proper divisors (26562220556).

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

21489913588 is a wasteful number, since it uses less digits than its factorization.

21489913588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722 (or 3707 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 58.

The spelling of 21489913588 in words is "twenty-one billion, four hundred eighty-nine million, nine hundred thirteen thousand, five hundred eighty-eight".