21031653882 has 32 divisors (see below), whose sum is σ = 43997022720. Its totient is φ = 6689722160.

The previous prime is 21031653829. The next prime is 21031653883. The reversal of 21031653882 is 28835613012.

It is a self number, because there is not a number n which added to its sum of digits gives 21031653882.

It is not an unprimeable number, because it can be changed into a prime (21031653883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124044 + ... + 239687.

It is an arithmetic number, because the mean of its divisors is an integer number (1374906960).

Almost surely, 2^21031653882 is an apocalyptic number.

21031653882 is an abundant number, since it is smaller than the sum of its proper divisors (22965368838).

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

21031653882 is a wasteful number, since it uses less digits than its factorization.

21031653882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364178.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 21031653882 in words is "twenty-one billion, thirty-one million, six hundred fifty-three thousand, eight hundred eighty-two".