21097829832 has 32 divisors (see below), whose sum is σ = 52748798400. Its totient is φ = 7032046784.

The previous prime is 21097829807. The next prime is 21097829917. The reversal of 21097829832 is 23892879012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362413 + ... + 416579.

It is an arithmetic number, because the mean of its divisors is an integer number (1648399950).

Almost surely, 2^21097829832 is an apocalyptic number.

It is an amenable number.

21097829832 is an abundant number, since it is smaller than the sum of its proper divisors (31650968568).

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

21097829832 is a wasteful number, since it uses less digits than its factorization.

21097829832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70405 (or 70401 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 21097829832 in words is "twenty-one billion, ninety-seven million, eight hundred twenty-nine thousand, eight hundred thirty-two".