221234342121 has 32 divisors (see below), whose sum is σ = 353000229120. Its totient is φ = 136131190272.

The previous prime is 221234342113. The next prime is 221234342149. The reversal of 221234342121 is 121243432122.

221234342121 is a `hidden beast` number, since 2 + 2 + 1 + 234 + 3 + 421 + 2 + 1 = 666.

It is not a de Polignac number, because 221234342121 - 2³ = 221234342113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (221234342191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4702105 + ... + 4748921.

It is an arithmetic number, because the mean of its divisors is an integer number (11031257160).

Almost surely, 2^221234342121 is an apocalyptic number.

It is an amenable number.

221234342121 is a deficient number, since it is larger than the sum of its proper divisors (131765886999).

221234342121 is a wasteful number, since it uses less digits than its factorization.

221234342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60302 (or 60296 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 221234342121 its reverse (121243432122), we get a palindrome (342477774243).

Subtracting from 221234342121 its reverse (121243432122), we obtain a palindrome (99990909999).

The spelling of 221234342121 in words is "two hundred twenty-one billion, two hundred thirty-four million, three hundred forty-two thousand, one hundred twenty-one".