2166885590121 has 12 divisors (see below), whose sum is σ = 3577080974272. Its totient is φ = 1238220337176.

The previous prime is 2166885590113. The next prime is 2166885590137. The reversal of 2166885590121 is 1210955886612.

2166885590121 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 88 + 559 + 0 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 2166885590121 - 2³ = 2166885590113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2166885510121) 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, 17197504621 + ... + 17197504746.

Almost surely, 2^{2166885590121} is an apocalyptic number.

2166885590121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2166885590121 is a deficient number, since it is larger than the sum of its proper divisors (1410195384151).

2166885590121 is a wasteful number, since it uses less digits than its factorization.

2166885590121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34395009380 (or 34395009377 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 2166885590121 in words is "two trillion, one hundred sixty-six billion, eight hundred eighty-five million, five hundred ninety thousand, one hundred twenty-one".