221002223231 has 4 divisors (see below), whose sum is σ = 222957995232. Its totient is φ = 219046451232.

The previous prime is 221002223219. The next prime is 221002223279. The reversal of 221002223231 is 132322200122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002223231 is a prime.

It is a super-2 number, since 2×221002223231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002225231) 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, 977885831 + ... + 977886056.

It is an arithmetic number, because the mean of its divisors is an integer number (55739498808).

Almost surely, 2^221002223231 is an apocalyptic number.

221002223231 is a deficient number, since it is larger than the sum of its proper divisors (1955772001).

221002223231 is a wasteful number, since it uses less digits than its factorization.

221002223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955772000.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 221002223231 its reverse (132322200122), we get a palindrome (353324423353).

The spelling of 221002223231 in words is "two hundred twenty-one billion, two million, two hundred twenty-three thousand, two hundred thirty-one".