121561022779 has 8 divisors (see below), whose sum is σ = 138950601440. Its totient is φ = 104177373696.

The previous prime is 121561022777. The next prime is 121561022857. The reversal of 121561022779 is 977220165121.

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 121561022779 - 2¹ = 121561022777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121561022777) 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 7 ways as a sum of consecutive naturals, for example, 1438374 + ... + 1520539.

It is an arithmetic number, because the mean of its divisors is an integer number (17368825180).

Almost surely, 2^121561022779 is an apocalyptic number.

121561022779 is a deficient number, since it is larger than the sum of its proper divisors (17389578661).

121561022779 is an equidigital number, since it uses as much as digits as its factorization.

121561022779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964789.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 121561022779 in words is "one hundred twenty-one billion, five hundred sixty-one million, twenty-two thousand, seven hundred seventy-nine".