121212112222191 has 8 divisors (see below), whose sum is σ = 161616211397424. Its totient is φ = 80808043930880.

The previous prime is 121212112222153. The next prime is 121212112222199. The reversal of 121212112222191 is 191222211212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121212112222191 - 2¹³ = 121212112213999 is a prime.

It is a super-2 number, since 2×121212112222191² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212112222199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3962431 + ... + 16066271.

It is an arithmetic number, because the mean of its divisors is an integer number (20202026424678).

Almost surely, 2^{121212112222191} is an apocalyptic number.

121212112222191 is a deficient number, since it is larger than the sum of its proper divisors (40404099175233).

121212112222191 is a wasteful number, since it uses less digits than its factorization.

121212112222191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15441961.

The product of its digits is 1152, while the sum is 30.

The spelling of 121212112222191 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, two hundred twenty-two thousand, one hundred ninety-one".