221022231131 has 4 divisors (see below), whose sum is σ = 238023941232. Its totient is φ = 204020521032.

The previous prime is 221022231127. The next prime is 221022231137. The reversal of 221022231131 is 131132220122.

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

It is a cyclic number.

It is not a de Polignac number, because 221022231131 - 2² = 221022231127 is a prime.

It is a super-2 number, since 2×221022231131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221022231137) 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, 8500855031 + ... + 8500855056.

It is an arithmetic number, because the mean of its divisors is an integer number (59505985308).

Almost surely, 2^221022231131 is an apocalyptic number.

221022231131 is a deficient number, since it is larger than the sum of its proper divisors (17001710101).

221022231131 is a wasteful number, since it uses less digits than its factorization.

221022231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17001710100.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221022231131 its reverse (131132220122), we get a palindrome (352154451253).

The spelling of 221022231131 in words is "two hundred twenty-one billion, twenty-two million, two hundred thirty-one thousand, one hundred thirty-one".