21130397884 has 6 divisors (see below), whose sum is σ = 36978196304. Its totient is φ = 10565198940.

The previous prime is 21130397867. The next prime is 21130397903. The reversal of 21130397884 is 48879303112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2641299732 + ... + 2641299739.

Almost surely, 2^21130397884 is an apocalyptic number.

It is an amenable number.

21130397884 is a deficient number, since it is larger than the sum of its proper divisors (15847798420).

21130397884 is a wasteful number, since it uses less digits than its factorization.

21130397884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282599475 (or 5282599473 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 21130397884 in words is "twenty-one billion, one hundred thirty million, three hundred ninety-seven thousand, eight hundred eighty-four".