21920725350572 has 6 divisors (see below), whose sum is σ = 38361269363508. Its totient is φ = 10960362675284.

The previous prime is 21920725350539. The next prime is 21920725350599. The reversal of 21920725350572 is 27505352702912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21920725350572.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2740090668818 + ... + 2740090668825.

It is an arithmetic number, because the mean of its divisors is an integer number (6393544893918).

Almost surely, 2^{21920725350572} is an apocalyptic number.

It is an amenable number.

21920725350572 is a deficient number, since it is larger than the sum of its proper divisors (16440544012936).

21920725350572 is a wasteful number, since it uses less digits than its factorization.

21920725350572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480181337647 (or 5480181337645 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 21920725350572 in words is "twenty-one trillion, nine hundred twenty billion, seven hundred twenty-five million, three hundred fifty thousand, five hundred seventy-two".