21502676673 has 24 divisors (see below), whose sum is σ = 32257929600. Its totient is φ = 13792300704.

The previous prime is 21502676659. The next prime is 21502676677. The reversal of 21502676673 is 37667620512.

21502676673 is a `hidden beast` number, since 2 + 1 + 502 + 6 + 76 + 6 + 73 = 666.

It is not a de Polignac number, because 21502676673 - 2⁵ = 21502676641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21502676677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 405838 + ... + 455751.

It is an arithmetic number, because the mean of its divisors is an integer number (1344080400).

Almost surely, 2^21502676673 is an apocalyptic number.

It is an amenable number.

21502676673 is a deficient number, since it is larger than the sum of its proper divisors (10755252927).

21502676673 is a wasteful number, since it uses less digits than its factorization.

21502676673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861701 (or 861698 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 21502676673 in words is "twenty-one billion, five hundred two million, six hundred seventy-six thousand, six hundred seventy-three".