21461908984 has 16 divisors (see below), whose sum is σ = 40280585400. Its totient is φ = 10720419552.

The previous prime is 21461908973. The next prime is 21461908991. The reversal of 21461908984 is 48980916412.

It is a super-2 number, since 2×21461908984² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1308207 + ... + 1324510.

Almost surely, 2^21461908984 is an apocalyptic number.

It is an amenable number.

21461908984 is a deficient number, since it is larger than the sum of its proper divisors (18818676416).

21461908984 is a wasteful number, since it uses less digits than its factorization.

21461908984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633742 (or 2633738 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 21461908984 in words is "twenty-one billion, four hundred sixty-one million, nine hundred eight thousand, nine hundred eighty-four".