21266411666115 has 192 divisors, whose sum is σ = 43976094317568. Its totient is φ = 8586792529920.

The previous prime is 21266411666113. The next prime is 21266411666141. The reversal of 21266411666115 is 51166611466212.

It is not a de Polignac number, because 21266411666115 - 2¹ = 21266411666113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21266411666113) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 61969039 + ... + 62311271.

It is an arithmetic number, because the mean of its divisors is an integer number (229042157904).

Almost surely, 2^{21266411666115} is an apocalyptic number.

21266411666115 is an abundant number, since it is smaller than the sum of its proper divisors (22709682651453).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21266411666115 is a wasteful number, since it uses less digits than its factorization.

21266411666115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342410 (or 342399 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The spelling of 21266411666115 in words is "twenty-one trillion, two hundred sixty-six billion, four hundred eleven million, six hundred sixty-six thousand, one hundred fifteen".