21732398732 has 24 divisors (see below), whose sum is σ = 43929663120. Its totient is φ = 9297282560.

The previous prime is 21732398717. The next prime is 21732398777. The reversal of 21732398732 is 23789323712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14526257 + ... + 14527752.

It is an arithmetic number, because the mean of its divisors is an integer number (1830402630).

Almost surely, 2^21732398732 is an apocalyptic number.

21732398732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21732398732 is an abundant number, since it is smaller than the sum of its proper divisors (22197264388).

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

21732398732 is a wasteful number, since it uses less digits than its factorization.

21732398732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29054041 (or 29054039 counting only the distinct ones).

The product of its digits is 762048, while the sum is 47.

The spelling of 21732398732 in words is "twenty-one billion, seven hundred thirty-two million, three hundred ninety-eight thousand, seven hundred thirty-two".