21897699136 has 28 divisors (see below), whose sum is σ = 43483215040. Its totient is φ = 10941298560.

The previous prime is 21897699127. The next prime is 21897699157. The reversal of 21897699136 is 63199679812.

It is a congruent number.

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, 23880 + ... + 210631.

Almost surely, 2^21897699136 is an apocalyptic number.

It is an amenable number.

21897699136 is a deficient number, since it is larger than the sum of its proper divisors (21585515904).

21897699136 is a wasteful number, since it uses less digits than its factorization.

21897699136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235982 (or 235972 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 61.

The spelling of 21897699136 in words is "twenty-one billion, eight hundred ninety-seven million, six hundred ninety-nine thousand, one hundred thirty-six".