121216019979 has 16 divisors (see below), whose sum is σ = 162851622912. Its totient is φ = 80195915328.

The previous prime is 121216019941. The next prime is 121216020019. The reversal of 121216019979 is 979910612121.

It is not a de Polignac number, because 121216019979 - 2⁸ = 121216019723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121216019929) 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, 1329862 + ... + 1418084.

It is an arithmetic number, because the mean of its divisors is an integer number (10178226432).

Almost surely, 2^121216019979 is an apocalyptic number.

121216019979 is a deficient number, since it is larger than the sum of its proper divisors (41635602933).

121216019979 is a wasteful number, since it uses less digits than its factorization.

121216019979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91706.

The product of its (nonzero) digits is 122472, while the sum is 48.

The spelling of 121216019979 in words is "one hundred twenty-one billion, two hundred sixteen million, nineteen thousand, nine hundred seventy-nine".