21959655436 has 12 divisors (see below), whose sum is σ = 38430641200. Its totient is φ = 10979472240.

The previous prime is 21959655379. The next prime is 21959655451. The reversal of 21959655436 is 63455695912.

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, 90226 + ... + 228166.

Almost surely, 2^21959655436 is an apocalyptic number.

It is an amenable number.

21959655436 is a deficient number, since it is larger than the sum of its proper divisors (16470985764).

21959655436 is a wasteful number, since it uses less digits than its factorization.

21959655436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177744 (or 177742 counting only the distinct ones).

The product of its digits is 8748000, while the sum is 55.

The spelling of 21959655436 in words is "twenty-one billion, nine hundred fifty-nine million, six hundred fifty-five thousand, four hundred thirty-six".