19221493264 has 20 divisors (see below), whose sum is σ = 37352163004. Its totient is φ = 9582225408.

The previous prime is 19221493259. The next prime is 19221493273. The reversal of 19221493264 is 46239412291.

It can be written as a sum of positive squares in 2 ways, for example, as 4381380864 + 14840112400 = 66192^2 + 121820^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19221493264.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777017 + ... + 1787800.

Almost surely, 2^19221493264 is an apocalyptic number.

It is an amenable number.

19221493264 is a deficient number, since it is larger than the sum of its proper divisors (18130669740).

19221493264 is a wasteful number, since it uses less digits than its factorization.

19221493264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565162 (or 3565156 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The spelling of 19221493264 in words is "nineteen billion, two hundred twenty-one million, four hundred ninety-three thousand, two hundred sixty-four".