221431434223 has 2 divisors, whose sum is σ = 221431434224. Its totient is φ = 221431434222.

The previous prime is 221431434197. The next prime is 221431434229. The reversal of 221431434223 is 322434134122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221431434223 is a prime.

It is a super-2 number, since 2×221431434223² (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 (221431434229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110715717111 + 110715717112.

It is an arithmetic number, because the mean of its divisors is an integer number (110715717112).

Almost surely, 2^221431434223 is an apocalyptic number.

221431434223 is a deficient number, since it is larger than the sum of its proper divisors (1).

221431434223 is an equidigital number, since it uses as much as digits as its factorization.

221431434223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 31.

Adding to 221431434223 its reverse (322434134122), we get a palindrome (543865568345).

The spelling of 221431434223 in words is "two hundred twenty-one billion, four hundred thirty-one million, four hundred thirty-four thousand, two hundred twenty-three".