12121012091 has 2 divisors, whose sum is σ = 12121012092. Its totient is φ = 12121012090.

The previous prime is 12121012069. The next prime is 12121012139. The reversal of 12121012091 is 19021012121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121012091 is a prime.

It is a super-2 number, since 2×12121012091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12121012061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060506045 + 6060506046.

It is an arithmetic number, because the mean of its divisors is an integer number (6060506046).

Almost surely, 2^12121012091 is an apocalyptic number.

12121012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121012091 is an equidigital number, since it uses as much as digits as its factorization.

12121012091 is an evil number, because the sum of its binary digits is even.

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

The spelling of 12121012091 in words is "twelve billion, one hundred twenty-one million, twelve thousand, ninety-one".