221320100231 has 2 divisors, whose sum is σ = 221320100232. Its totient is φ = 221320100230.

The previous prime is 221320100227. The next prime is 221320100237. The reversal of 221320100231 is 132001023122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221320100231 - 2² = 221320100227 is a prime.

It is a super-2 number, since 2×221320100231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221320100237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660050115 + 110660050116.

It is an arithmetic number, because the mean of its divisors is an integer number (110660050116).

Almost surely, 2^221320100231 is an apocalyptic number.

221320100231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221320100231 is an equidigital number, since it uses as much as digits as its factorization.

221320100231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221320100231 its reverse (132001023122), we get a palindrome (353321123353).

The spelling of 221320100231 in words is "two hundred twenty-one billion, three hundred twenty million, one hundred thousand, two hundred thirty-one".