221312144342231 has 2 divisors, whose sum is σ = 221312144342232. Its totient is φ = 221312144342230.

The previous prime is 221312144342227. The next prime is 221312144342269. The reversal of 221312144342231 is 132243441213122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221312144342231 - 2² = 221312144342227 is a prime.

It is a super-2 number, since 2×221312144342231² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221312144342191 and 221312144342200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221312144348231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110656072171115 + 110656072171116.

It is an arithmetic number, because the mean of its divisors is an integer number (110656072171116).

Almost surely, 2^{221312144342231} is an apocalyptic number.

221312144342231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221312144342231 is an equidigital number, since it uses as much as digits as its factorization.

221312144342231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 35.

Adding to 221312144342231 its reverse (132243441213122), we get a palindrome (353555585555353).

The spelling of 221312144342231 in words is "two hundred twenty-one trillion, three hundred twelve billion, one hundred forty-four million, three hundred forty-two thousand, two hundred thirty-one".