121212310091 has 2 divisors, whose sum is σ = 121212310092. Its totient is φ = 121212310090.

The previous prime is 121212310061. The next prime is 121212310123. The reversal of 121212310091 is 190013212121.

It is a weak prime.

It is an emirp because it is prime and its reverse (190013212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121212310091 - 2³⁴ = 104032440907 is a prime.

It is not a weakly prime, because it can be changed into another prime (121212310061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606155045 + 60606155046.

It is an arithmetic number, because the mean of its divisors is an integer number (60606155046).

Almost surely, 2^121212310091 is an apocalyptic number.

121212310091 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212310091 is an equidigital number, since it uses as much as digits as its factorization.

121212310091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 121212310091 in words is "one hundred twenty-one billion, two hundred twelve million, three hundred ten thousand, ninety-one".