221636585636121 has 8 divisors (see below), whose sum is σ = 308363945232960. Its totient is φ = 141333474898352.

The previous prime is 221636585636111. The next prime is 221636585636131. The reversal of 221636585636121 is 121636585636122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221636585636111) and next prime (221636585636131).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221636585636121 - 2⁹ = 221636585635609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221636585636111) 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 7 ways as a sum of consecutive naturals, for example, 1606062214686 + ... + 1606062214823.

It is an arithmetic number, because the mean of its divisors is an integer number (38545493154120).

Almost surely, 2^{221636585636121} is an apocalyptic number.

It is an amenable number.

221636585636121 is a deficient number, since it is larger than the sum of its proper divisors (86727359596839).

221636585636121 is a wasteful number, since it uses less digits than its factorization.

221636585636121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212124429535.

The product of its digits is 18662400, while the sum is 57.

Subtracting from 221636585636121 its reverse (121636585636122), we obtain a palindrome (99999999999999).

The spelling of 221636585636121 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, five hundred eighty-five million, six hundred thirty-six thousand, one hundred twenty-one".