21083770752 has 64 divisors (see below), whose sum is σ = 61095029760. Its totient is φ = 6389020160.

The previous prime is 21083770739. The next prime is 21083770759. The reversal of 21083770752 is 25707738012.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083770759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2491488 + ... + 2499935.

It is an arithmetic number, because the mean of its divisors is an integer number (954609840).

Almost surely, 2^21083770752 is an apocalyptic number.

21083770752 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21083770752 is an abundant number, since it is smaller than the sum of its proper divisors (40011259008).

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

21083770752 is a wasteful number, since it uses less digits than its factorization.

21083770752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4991451 (or 4991439 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The spelling of 21083770752 in words is "twenty-one billion, eighty-three million, seven hundred seventy thousand, seven hundred fifty-two".