221201231231 has 2 divisors, whose sum is σ = 221201231232. Its totient is φ = 221201231230.

The previous prime is 221201231179. The next prime is 221201231233. The reversal of 221201231231 is 132132102122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221201231231 - 2²² = 221197036927 is a prime.

It is a super-2 number, since 2×221201231231² (a number of 23 digits) contains 22 as substring.

Together with 221201231233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221201231233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600615615 + 110600615616.

It is an arithmetic number, because the mean of its divisors is an integer number (110600615616).

Almost surely, 2^221201231231 is an apocalyptic number.

221201231231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201231231 is an equidigital number, since it uses as much as digits as its factorization.

221201231231 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221201231231 its reverse (132132102122), we get a palindrome (353333333353).

The spelling of 221201231231 in words is "two hundred twenty-one billion, two hundred one million, two hundred thirty-one thousand, two hundred thirty-one".