21069562312 has 24 divisors (see below), whose sum is σ = 39586589910. Its totient is φ = 10513157120.

The previous prime is 21069562309. The next prime is 21069562361. The reversal of 21069562312 is 21326596012.

It can be written as a sum of positive squares in only one way, i.e., 13821764356 + 7247797956 = 117566^2 + 85134^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10393443 + ... + 10395469.

Almost surely, 2^21069562312 is an apocalyptic number.

It is an amenable number.

21069562312 is a deficient number, since it is larger than the sum of its proper divisors (18517027598).

21069562312 is an frugal number, since it uses more digits than its factorization.

21069562312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701 (or 2670 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 21069562312 in words is "twenty-one billion, sixty-nine million, five hundred sixty-two thousand, three hundred twelve".