2102111878331 has 2 divisors, whose sum is σ = 2102111878332. Its totient is φ = 2102111878330.

The previous prime is 2102111878319. The next prime is 2102111878367. The reversal of 2102111878331 is 1338781112012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102111878331 is a prime.

It is a super-2 number, since 2×2102111878331² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2102111878231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051055939165 + 1051055939166.

It is an arithmetic number, because the mean of its divisors is an integer number (1051055939166).

Almost surely, 2^{2102111878331} is an apocalyptic number.

2102111878331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102111878331 is an equidigital number, since it uses as much as digits as its factorization.

2102111878331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 2102111878331 in words is "two trillion, one hundred two billion, one hundred eleven million, eight hundred seventy-eight thousand, three hundred thirty-one".