121879913947 has 16 divisors (see below), whose sum is σ = 140047488000. Its totient is φ = 104901078240.

The previous prime is 121879913873. The next prime is 121879913963. The reversal of 121879913947 is 749319978121.

It is a cyclic number.

It is not a de Polignac number, because 121879913947 - 2¹⁹ = 121879389659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121879913977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141429 + ... + 513577.

It is an arithmetic number, because the mean of its divisors is an integer number (8752968000).

Almost surely, 2^121879913947 is an apocalyptic number.

121879913947 is a deficient number, since it is larger than the sum of its proper divisors (18167574053).

121879913947 is a wasteful number, since it uses less digits than its factorization.

121879913947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373746.

The product of its digits is 6858432, while the sum is 61.

The spelling of 121879913947 in words is "one hundred twenty-one billion, eight hundred seventy-nine million, nine hundred thirteen thousand, nine hundred forty-seven".