121577521011 has 16 divisors (see below), whose sum is σ = 172394987904. Its totient is φ = 75947874944.

The previous prime is 121577520997. The next prime is 121577521063. The reversal of 121577521011 is 110125775121.

It is a cyclic number.

It is not a de Polignac number, because 121577521011 - 2²¹ = 121575423859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121577521111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5239245 + ... + 5262398.

It is an arithmetic number, because the mean of its divisors is an integer number (10774686744).

Almost surely, 2^121577521011 is an apocalyptic number.

121577521011 is a deficient number, since it is larger than the sum of its proper divisors (50817466893).

121577521011 is a wasteful number, since it uses less digits than its factorization.

121577521011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501890.

The product of its (nonzero) digits is 4900, while the sum is 33.

The spelling of 121577521011 in words is "one hundred twenty-one billion, five hundred seventy-seven million, five hundred twenty-one thousand, eleven".