222100031221 has 4 divisors (see below), whose sum is σ = 222110092672. Its totient is φ = 222089969772.

The previous prime is 222100031191. The next prime is 222100031227. The reversal of 222100031221 is 122130001222.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 222100031221 - 2¹⁷ = 222099900149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222100031195 and 222100031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222100031227) 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, 4997541 + ... + 5041786.

It is an arithmetic number, because the mean of its divisors is an integer number (55527523168).

Almost surely, 2^222100031221 is an apocalyptic number.

It is an amenable number.

222100031221 is a deficient number, since it is larger than the sum of its proper divisors (10061451).

222100031221 is a wasteful number, since it uses less digits than its factorization.

222100031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061450.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 222100031221 its reverse (122130001222), we get a palindrome (344230032443).

The spelling of 222100031221 in words is "two hundred twenty-two billion, one hundred million, thirty-one thousand, two hundred twenty-one".