21920364974 has 8 divisors (see below), whose sum is σ = 32885002848. Its totient is φ = 10958697360.

The previous prime is 21920364971. The next prime is 21920364979. The reversal of 21920364974 is 47946302912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21920364971) 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, 724022 + ... + 753689.

It is an arithmetic number, because the mean of its divisors is an integer number (4110625356).

Almost surely, 2^21920364974 is an apocalyptic number.

21920364974 is a deficient number, since it is larger than the sum of its proper divisors (10964637874).

21920364974 is a wasteful number, since it uses less digits than its factorization.

21920364974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485130.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 21920364974 in words is "twenty-one billion, nine hundred twenty million, three hundred sixty-four thousand, nine hundred seventy-four".