21671361752 has 64 divisors (see below), whose sum is σ = 41584354560. Its totient is φ = 10585872000.

The previous prime is 21671361731. The next prime is 21671361799. The reversal of 21671361752 is 25716317612.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 33187058 + ... + 33187710.

It is an arithmetic number, because the mean of its divisors is an integer number (649755540).

Almost surely, 2^21671361752 is an apocalyptic number.

It is an amenable number.

21671361752 is a deficient number, since it is larger than the sum of its proper divisors (19912992808).

21671361752 is a wasteful number, since it uses less digits than its factorization.

21671361752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1220 counting only the distinct ones).

The product of its digits is 105840, while the sum is 41.

The spelling of 21671361752 in words is "twenty-one billion, six hundred seventy-one million, three hundred sixty-one thousand, seven hundred fifty-two".