642541226121 has 12 divisors (see below), whose sum is σ = 982710110772. Its totient is φ = 403163122176.

The previous prime is 642541226077. The next prime is 642541226123. The reversal of 642541226121 is 121622145246.

642541226121 is a `hidden beast` number, since 6 + 4 + 25 + 4 + 12 + 2 + 612 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 234124370496 + 408416855625 = 483864^2 + 639075^2 .

It is not a de Polignac number, because 642541226121 - 2⁶ = 642541226057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642541226123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2099807776 + ... + 2099808081.

It is an arithmetic number, because the mean of its divisors is an integer number (81892509231).

Almost surely, 2^642541226121 is an apocalyptic number.

It is an amenable number.

642541226121 is a deficient number, since it is larger than the sum of its proper divisors (340168884651).

642541226121 is a wasteful number, since it uses less digits than its factorization.

642541226121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4199615880 (or 4199615877 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The spelling of 642541226121 in words is "six hundred forty-two billion, five hundred forty-one million, two hundred twenty-six thousand, one hundred twenty-one".