121620566671 has 4 divisors (see below), whose sum is σ = 121707502000. Its totient is φ = 121533631344.

The previous prime is 121620566623. The next prime is 121620566681. The reversal of 121620566671 is 176665026121.

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 121620566671 - 2²⁷ = 121486348943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620566611) 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 3 ways as a sum of consecutive naturals, for example, 43465566 + ... + 43468363.

It is an arithmetic number, because the mean of its divisors is an integer number (30426875500).

Almost surely, 2^121620566671 is an apocalyptic number.

121620566671 is a deficient number, since it is larger than the sum of its proper divisors (86935329).

121620566671 is an equidigital number, since it uses as much as digits as its factorization.

121620566671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86935328.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 121620566671 in words is "one hundred twenty-one billion, six hundred twenty million, five hundred sixty-six thousand, six hundred seventy-one".