21097789488 has 30 divisors (see below), whose sum is σ = 59044508484. Its totient is φ = 7032596448.

The previous prime is 21097789483. The next prime is 21097789543. The reversal of 21097789488 is 88498779012.

21097789488 is a `hidden beast` number, since 2 + 1 + 0 + 9 + 77 + 89 + 488 = 666.

It is not an unprimeable number, because it can be changed into a prime (21097789483) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73256070 + ... + 73256357.

Almost surely, 2^21097789488 is an apocalyptic number.

It is an amenable number.

21097789488 is an abundant number, since it is smaller than the sum of its proper divisors (37946718996).

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

21097789488 is a wasteful number, since it uses less digits than its factorization.

21097789488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146512441 (or 146512432 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 21097789488 in words is "twenty-one billion, ninety-seven million, seven hundred eighty-nine thousand, four hundred eighty-eight".