221534531223457 has 2 divisors, whose sum is σ = 221534531223458. Its totient is φ = 221534531223456.

The previous prime is 221534531223433. The next prime is 221534531223497. The reversal of 221534531223457 is 754322135435122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220403745692001 + 1130785531456 = 14846001^2 + 1063384^2 .

It is a cyclic number.

It is not a de Polignac number, because 221534531223457 - 2²⁷ = 221534397005729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221534531223457.

It is not a weakly prime, because it can be changed into another prime (221534531223497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767265611728 + 110767265611729.

It is an arithmetic number, because the mean of its divisors is an integer number (110767265611729).

Almost surely, 2^{221534531223457} is an apocalyptic number.

It is an amenable number.

221534531223457 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534531223457 is an equidigital number, since it uses as much as digits as its factorization.

221534531223457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048000, while the sum is 49.

Adding to 221534531223457 its reverse (754322135435122), we get a palindrome (975856666658579).

The spelling of 221534531223457 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, five hundred thirty-one million, two hundred twenty-three thousand, four hundred fifty-seven".