21761925072 has 20 divisors (see below), whose sum is σ = 56218306560. Its totient is φ = 7253975008.

The previous prime is 21761925067. The next prime is 21761925079. The reversal of 21761925072 is 27052916712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761925079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226686672 + ... + 226686767.

It is an arithmetic number, because the mean of its divisors is an integer number (2810915328).

Almost surely, 2^21761925072 is an apocalyptic number.

It is an amenable number.

21761925072 is an abundant number, since it is smaller than the sum of its proper divisors (34456381488).

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

21761925072 is a wasteful number, since it uses less digits than its factorization.

21761925072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453373450 (or 453373444 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 21761925072 in words is "twenty-one billion, seven hundred sixty-one million, nine hundred twenty-five thousand, seventy-two".