121212111958 has 32 divisors (see below), whose sum is σ = 209065276224. Its totient is φ = 51629985792.

The previous prime is 121212111947. The next prime is 121212111959. The reversal of 121212111958 is 859111212121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212111959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8947366 + ... + 8960902.

It is an arithmetic number, because the mean of its divisors is an integer number (6533289882).

Almost surely, 2^121212111958 is an apocalyptic number.

121212111958 is a deficient number, since it is larger than the sum of its proper divisors (87853164266).

121212111958 is a wasteful number, since it uses less digits than its factorization.

121212111958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17416.

The product of its digits is 2880, while the sum is 34.

The spelling of 121212111958 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred fifty-eight".