21219274372 has 6 divisors (see below), whose sum is σ = 37133730158. Its totient is φ = 10609637184.

The previous prime is 21219274367. The next prime is 21219274399. The reversal of 21219274372 is 27347291212.

It can be written as a sum of positive squares in only one way, i.e., 20939247616 + 280026756 = 144704^2 + 16734^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652409293 + ... + 2652409300.

Almost surely, 2^21219274372 is an apocalyptic number.

It is an amenable number.

21219274372 is a deficient number, since it is larger than the sum of its proper divisors (15914455786).

21219274372 is a wasteful number, since it uses less digits than its factorization.

21219274372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5304818597 (or 5304818595 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The spelling of 21219274372 in words is "twenty-one billion, two hundred nineteen million, two hundred seventy-four thousand, three hundred seventy-two".