221222202431 has 2 divisors, whose sum is σ = 221222202432. Its totient is φ = 221222202430.

The previous prime is 221222202401. The next prime is 221222202451. The reversal of 221222202431 is 134202222122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221222202431 - 2⁶ = 221222202367 is a prime.

It is a super-2 number, since 2×221222202431² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 221222202397 and 221222202406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222202401) 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, 110611101215 + 110611101216.

It is an arithmetic number, because the mean of its divisors is an integer number (110611101216).

Almost surely, 2^221222202431 is an apocalyptic number.

221222202431 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222202431 is an equidigital number, since it uses as much as digits as its factorization.

221222202431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221222202431 its reverse (134202222122), we get a palindrome (355424424553).

The spelling of 221222202431 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred two thousand, four hundred thirty-one".