21616698868149 has 24 divisors (see below), whose sum is σ = 36206481855040. Its totient is φ = 11229453956160.

The previous prime is 21616698868117. The next prime is 21616698868151. The reversal of 21616698868149 is 94186889661612.

It is not a de Polignac number, because 21616698868149 - 2⁵ = 21616698868117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616698868109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4253578504 + ... + 4253583585.

Almost surely, 2^{21616698868149} is an apocalyptic number.

It is an amenable number.

21616698868149 is a deficient number, since it is larger than the sum of its proper divisors (14589782986891).

21616698868149 is a wasteful number, since it uses less digits than its factorization.

21616698868149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8507162121 (or 8507162110 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 75.

The spelling of 21616698868149 in words is "twenty-one trillion, six hundred sixteen billion, six hundred ninety-eight million, eight hundred sixty-eight thousand, one hundred forty-nine".