21088589788 has 12 divisors (see below), whose sum is σ = 42177179632. Its totient is φ = 9037967040.

The previous prime is 21088589773. The next prime is 21088589833. The reversal of 21088589788 is 88798588012.

21088589788 is an admirable number.

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, 376581933 + ... + 376581988.

Almost surely, 2^21088589788 is an apocalyptic number.

21088589788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21088589788 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21088589788 is a wasteful number, since it uses less digits than its factorization.

21088589788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753163932 (or 753163930 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 64.

The spelling of 21088589788 in words is "twenty-one billion, eighty-eight million, five hundred eighty-nine thousand, seven hundred eighty-eight".