21739056857352 has 40 divisors (see below), whose sum is σ = 60889487958750. Its totient is φ = 7246352285568.

The previous prime is 21739056857333. The next prime is 21739056857383. The reversal of 21739056857352 is 25375865093712.

21739056857352 is a `hidden beast` number, since 2 + 1 + 7 + 3 + 9 + 0 + 5 + 6 + 8 + 573 + 52 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15618509504676 + 6120547352676 = 3952026^2 + 2473974^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21739056857352.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16773962977 + ... + 16773964272.

Almost surely, 2^{21739056857352} is an apocalyptic number.

It is an amenable number.

21739056857352 is an abundant number, since it is smaller than the sum of its proper divisors (39150431101398).

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

21739056857352 is a wasteful number, since it uses less digits than its factorization.

21739056857352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33547927267 (or 33547927254 counting only the distinct ones).

The product of its (nonzero) digits is 95256000, while the sum is 63.

The spelling of 21739056857352 in words is "twenty-one trillion, seven hundred thirty-nine billion, fifty-six million, eight hundred fifty-seven thousand, three hundred fifty-two".