21574889236 has 6 divisors (see below), whose sum is σ = 37756056170. Its totient is φ = 10787444616.

The previous prime is 21574889233. The next prime is 21574889267. The reversal of 21574889236 is 63298847512.

It can be written as a sum of positive squares in only one way, i.e., 15915336336 + 5659552900 = 126156^2 + 75230^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21574889233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2696861151 + ... + 2696861158.

Almost surely, 2^21574889236 is an apocalyptic number.

It is an amenable number.

21574889236 is a deficient number, since it is larger than the sum of its proper divisors (16181166934).

21574889236 is a wasteful number, since it uses less digits than its factorization.

21574889236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393722313 (or 5393722311 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 21574889236 in words is "twenty-one billion, five hundred seventy-four million, eight hundred eighty-nine thousand, two hundred thirty-six".