2121642236635 has 16 divisors (see below), whose sum is σ = 2555466859296. Its totient is φ = 1690984470528.

The previous prime is 2121642236629. The next prime is 2121642236669. The reversal of 2121642236635 is 5366322461212.

It is a cyclic number.

It is not a de Polignac number, because 2121642236635 - 2²⁵ = 2121608682203 is a prime.

It is a super-2 number, since 2×2121642236635² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121642236591 and 2121642236600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12105147 + ... + 12279163.

It is an arithmetic number, because the mean of its divisors is an integer number (159716678706).

Almost surely, 2^{2121642236635} is an apocalyptic number.

2121642236635 is a deficient number, since it is larger than the sum of its proper divisors (433824622661).

2121642236635 is a wasteful number, since it uses less digits than its factorization.

2121642236635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183102.

The product of its digits is 622080, while the sum is 43.

Adding to 2121642236635 its reverse (5366322461212), we get a palindrome (7487964697847).

The spelling of 2121642236635 in words is "two trillion, one hundred twenty-one billion, six hundred forty-two million, two hundred thirty-six thousand, six hundred thirty-five".