21761901472 has 48 divisors (see below), whose sum is σ = 43403163552. Its totient is φ = 10739139840.

The previous prime is 21761901457. The next prime is 21761901479. The reversal of 21761901472 is 27410916712.

It is not an unprimeable number, because it can be changed into a prime (21761901479) 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, 3106678 + ... + 3113674.

It is an arithmetic number, because the mean of its divisors is an integer number (904232574).

Almost surely, 2^21761901472 is an apocalyptic number.

It is an amenable number.

21761901472 is a deficient number, since it is larger than the sum of its proper divisors (21641262080).

21761901472 is a wasteful number, since it uses less digits than its factorization.

21761901472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8261 (or 8253 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 21761901472 in words is "twenty-one billion, seven hundred sixty-one million, nine hundred one thousand, four hundred seventy-two".