2102121010091 has 2 divisors, whose sum is σ = 2102121010092. Its totient is φ = 2102121010090.

The previous prime is 2102121010069. The next prime is 2102121010159. The reversal of 2102121010091 is 1900101212012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2102121010091 - 2¹⁰ = 2102121009067 is a prime.

It is a super-2 number, since 2×2102121010091² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2102121010001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051060505045 + 1051060505046.

It is an arithmetic number, because the mean of its divisors is an integer number (1051060505046).

Almost surely, 2^{2102121010091} is an apocalyptic number.

2102121010091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102121010091 is an equidigital number, since it uses as much as digits as its factorization.

2102121010091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 2102121010091 in words is "two trillion, one hundred two billion, one hundred twenty-one million, ten thousand, ninety-one".