121980838862779 has 4 divisors (see below), whose sum is σ = 131363980313776. Its totient is φ = 112597697411784.

The previous prime is 121980838862731. The next prime is 121980838862797. The reversal of 121980838862779 is 977268838089121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121980838862779 - 2¹⁷ = 121980838731707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121980838862699 and 121980838862708.

It is not an unprimeable number, because it can be changed into a prime (121980838862479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4691570725479 + ... + 4691570725504.

It is an arithmetic number, because the mean of its divisors is an integer number (32840995078444).

Almost surely, 2^{121980838862779} is an apocalyptic number.

121980838862779 is a deficient number, since it is larger than the sum of its proper divisors (9383141450997).

121980838862779 is an equidigital number, since it uses as much as digits as its factorization.

121980838862779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9383141450996.

The product of its (nonzero) digits is 1170505728, while the sum is 79.

The spelling of 121980838862779 in words is "one hundred twenty-one trillion, nine hundred eighty billion, eight hundred thirty-eight million, eight hundred sixty-two thousand, seven hundred seventy-nine".