21616652169 has 60 divisors (see below), whose sum is σ = 37117464384. Its totient is φ = 12281515488.

The previous prime is 21616652149. The next prime is 21616652201. The reversal of 21616652169 is 96125661612.

21616652169 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 66 + 521 + 69 = 666.

It is not a de Polignac number, because 21616652169 - 2²⁹ = 21079781257 is a prime.

It is a super-2 number, since 2×21616652169² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21616652149) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 29733684 + ... + 29734410.

Almost surely, 2^21616652169 is an apocalyptic number.

It is an amenable number.

21616652169 is a deficient number, since it is larger than the sum of its proper divisors (15500812215).

21616652169 is an frugal number, since it uses more digits than its factorization.

21616652169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204 (or 966 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 21616652169 in words is "twenty-one billion, six hundred sixteen million, six hundred fifty-two thousand, one hundred sixty-nine".