121220772734555 has 32 divisors (see below), whose sum is σ = 156891232592640. Its totient is φ = 89381645337600.

The previous prime is 121220772734527. The next prime is 121220772734587. The reversal of 121220772734555 is 555437277022121.

It is not a de Polignac number, because 121220772734555 - 2²² = 121220768540251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220772734497 and 121220772734506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 572600654 + ... + 572812316.

It is an arithmetic number, because the mean of its divisors is an integer number (4902851018520).

Almost surely, 2^{121220772734555} is an apocalyptic number.

121220772734555 is a deficient number, since it is larger than the sum of its proper divisors (35670459858085).

121220772734555 is a wasteful number, since it uses less digits than its factorization.

121220772734555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224951.

The product of its (nonzero) digits is 8232000, while the sum is 53.

The spelling of 121220772734555 in words is "one hundred twenty-one trillion, two hundred twenty billion, seven hundred seventy-two million, seven hundred thirty-four thousand, five hundred fifty-five".