221431102131061 has 2 divisors, whose sum is σ = 221431102131062. Its totient is φ = 221431102131060.

The previous prime is 221431102131037. The next prime is 221431102131097. The reversal of 221431102131061 is 160131201134122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189519550892100 + 31911551238961 = 13766610^2 + 5649031^2 .

It is a cyclic number.

It is not a de Polignac number, because 221431102131061 - 2¹⁵ = 221431102098293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221431102137061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110715551065530 + 110715551065531.

It is an arithmetic number, because the mean of its divisors is an integer number (110715551065531).

Almost surely, 2^{221431102131061} is an apocalyptic number.

It is an amenable number.

221431102131061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221431102131061 is an equidigital number, since it uses as much as digits as its factorization.

221431102131061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 221431102131061 its reverse (160131201134122), we get a palindrome (381562303265183).

The spelling of 221431102131061 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, one hundred two million, one hundred thirty-one thousand, sixty-one".