2166760572021 has 12 divisors (see below), whose sum is σ = 3132867132460. Its totient is φ = 1443075419520.

The previous prime is 2166760572001. The next prime is 2166760572037. The reversal of 2166760572021 is 1202750676612.

2166760572021 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 76 + 0 + 572 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 469704622500 + 1697055949521 = 685350^2 + 1302711^2 .

It is not a de Polignac number, because 2166760572021 - 2¹⁴ = 2166760555637 is a prime.

It is a super-2 number, since 2×2166760572021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166760572001) 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, 119292790 + ... + 119310951.

Almost surely, 2^{2166760572021} is an apocalyptic number.

It is an amenable number.

2166760572021 is a deficient number, since it is larger than the sum of its proper divisors (966106560439).

2166760572021 is a wasteful number, since it uses less digits than its factorization.

2166760572021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238604756 (or 238604753 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 2166760572021 in words is "two trillion, one hundred sixty-six billion, seven hundred sixty million, five hundred seventy-two thousand, twenty-one".