21167615653 has 12 divisors (see below), whose sum is σ = 21548930560. Its totient is φ = 20791738800.

The previous prime is 21167615639. The next prime is 21167615663. The reversal of 21167615653 is 35651676112.

It is a de Polignac number, because none of the positive numbers 2^k-21167615653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167615663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1287358 + ... + 1303696.

Almost surely, 2^21167615653 is an apocalyptic number.

It is an amenable number.

21167615653 is a deficient number, since it is larger than the sum of its proper divisors (381314907).

21167615653 is a wasteful number, since it uses less digits than its factorization.

21167615653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16668 (or 16567 counting only the distinct ones).

The product of its digits is 226800, while the sum is 43.

The spelling of 21167615653 in words is "twenty-one billion, one hundred sixty-seven million, six hundred fifteen thousand, six hundred fifty-three".