21392313188 has 48 divisors (see below), whose sum is σ = 41030705520. Its totient is φ = 9713872896.

The previous prime is 21392313149. The next prime is 21392313209. The reversal of 21392313188 is 88131329312.

It can be written as a sum of positive squares in 8 ways, for example, as 160326244 + 21231986944 = 12662^2 + 145712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5632106 + ... + 5635902.

It is an arithmetic number, because the mean of its divisors is an integer number (854806365).

Almost surely, 2^21392313188 is an apocalyptic number.

It is an amenable number.

21392313188 is a deficient number, since it is larger than the sum of its proper divisors (19638392332).

21392313188 is a wasteful number, since it uses less digits than its factorization.

21392313188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704 (or 6702 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The spelling of 21392313188 in words is "twenty-one billion, three hundred ninety-two million, three hundred thirteen thousand, one hundred eighty-eight".