221403031231 has 2 divisors, whose sum is σ = 221403031232. Its totient is φ = 221403031230.

The previous prime is 221403031193. The next prime is 221403031303. The reversal of 221403031231 is 132130304122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221403031231 - 2³¹ = 219255547583 is a prime.

It is a super-2 number, since 2×221403031231² (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 (221403731231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110701515615 + 110701515616.

It is an arithmetic number, because the mean of its divisors is an integer number (110701515616).

Almost surely, 2^221403031231 is an apocalyptic number.

221403031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221403031231 is an equidigital number, since it uses as much as digits as its factorization.

221403031231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221403031231 its reverse (132130304122), we get a palindrome (353533335353).

The spelling of 221403031231 in words is "two hundred twenty-one billion, four hundred three million, thirty-one thousand, two hundred thirty-one".