121206655603 has 4 divisors (see below), whose sum is σ = 132225442488. Its totient is φ = 110187868720.

The previous prime is 121206655579. The next prime is 121206655649. The reversal of 121206655603 is 306556602121.

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

It is a cyclic number.

It is not a de Polignac number, because 121206655603 - 2¹³ = 121206647411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121206655663) 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, 5509393426 + ... + 5509393447.

It is an arithmetic number, because the mean of its divisors is an integer number (33056360622).

Almost surely, 2^121206655603 is an apocalyptic number.

121206655603 is a deficient number, since it is larger than the sum of its proper divisors (11018786885).

121206655603 is a wasteful number, since it uses less digits than its factorization.

121206655603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11018786884.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 121206655603 in words is "one hundred twenty-one billion, two hundred six million, six hundred fifty-five thousand, six hundred three".