221321113291 has 2 divisors, whose sum is σ = 221321113292. Its totient is φ = 221321113290.

The previous prime is 221321113213. The next prime is 221321113301. The reversal of 221321113291 is 192311123122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221321113291 - 2¹⁹ = 221320589003 is a prime.

It is not a weakly prime, because it can be changed into another prime (221321119291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660556645 + 110660556646.

It is an arithmetic number, because the mean of its divisors is an integer number (110660556646).

Almost surely, 2^221321113291 is an apocalyptic number.

221321113291 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321113291 is an equidigital number, since it uses as much as digits as its factorization.

221321113291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The spelling of 221321113291 in words is "two hundred twenty-one billion, three hundred twenty-one million, one hundred thirteen thousand, two hundred ninety-one".