215605232323121 has 4 divisors (see below), whose sum is σ = 215605261983744. Its totient is φ = 215605202662500.

The previous prime is 215605232323099. The next prime is 215605232323127. The reversal of 215605232323121 is 121323232506512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 215605232323121 - 2⁶ = 215605232323057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215605232323127) 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, 4292816 + ... + 21204686.

It is an arithmetic number, because the mean of its divisors is an integer number (53901315495936).

Almost surely, 2^{215605232323121} is an apocalyptic number.

It is an amenable number.

215605232323121 is a deficient number, since it is larger than the sum of its proper divisors (29660623).

215605232323121 is a wasteful number, since it uses less digits than its factorization.

215605232323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29660622.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 215605232323121 its reverse (121323232506512), we get a palindrome (336928464829633).

The spelling of 215605232323121 in words is "two hundred fifteen trillion, six hundred five billion, two hundred thirty-two million, three hundred twenty-three thousand, one hundred twenty-one".