2102166511231 has 2 divisors, whose sum is σ = 2102166511232. Its totient is φ = 2102166511230.

The previous prime is 2102166511213. The next prime is 2102166511261. The reversal of 2102166511231 is 1321156612012.

Together with previous prime (2102166511213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2102166511231 - 2⁵ = 2102166511199 is a prime.

It is a super-2 number, since 2×2102166511231² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2102166511193 and 2102166511202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102166511261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051083255615 + 1051083255616.

It is an arithmetic number, because the mean of its divisors is an integer number (1051083255616).

Almost surely, 2^{2102166511231} is an apocalyptic number.

2102166511231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102166511231 is an equidigital number, since it uses as much as digits as its factorization.

2102166511231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 2102166511231 in words is "two trillion, one hundred two billion, one hundred sixty-six million, five hundred eleven thousand, two hundred thirty-one".