21798273388 has 24 divisors (see below), whose sum is σ = 39762741872. Its totient is φ = 10446283584.

The previous prime is 21798273353. The next prime is 21798273401. The reversal of 21798273388 is 88337289712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089231 + ... + 1109062.

Almost surely, 2^21798273388 is an apocalyptic number.

It is an amenable number.

21798273388 is a deficient number, since it is larger than the sum of its proper divisors (17964468484).

21798273388 is a wasteful number, since it uses less digits than its factorization.

21798273388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198401 (or 2198399 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The spelling of 21798273388 in words is "twenty-one billion, seven hundred ninety-eight million, two hundred seventy-three thousand, three hundred eighty-eight".