221321123131 has 2 divisors, whose sum is σ = 221321123132. Its totient is φ = 221321123130.

The previous prime is 221321123117. The next prime is 221321123137. The reversal of 221321123131 is 131321123122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221321123131 - 2³¹ = 219173639483 is a prime.

It is a super-2 number, since 2×221321123131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221321123137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660561565 + 110660561566.

It is an arithmetic number, because the mean of its divisors is an integer number (110660561566).

Almost surely, 2^221321123131 is an apocalyptic number.

221321123131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321123131 is an equidigital number, since it uses as much as digits as its factorization.

221321123131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

Adding to 221321123131 its reverse (131321123122), we get a palindrome (352642246253).

Subtracting from 221321123131 its reverse (131321123122), we obtain a palindrome (90000000009).

The spelling of 221321123131 in words is "two hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred thirty-one".