221253349991 has 2 divisors, whose sum is σ = 221253349992. Its totient is φ = 221253349990.

The previous prime is 221253349951. The next prime is 221253350023. The reversal of 221253349991 is 199943352122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221253349991 - 2¹⁴ = 221253333607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221253349931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110626674995 + 110626674996.

It is an arithmetic number, because the mean of its divisors is an integer number (110626674996).

Almost surely, 2^221253349991 is an apocalyptic number.

221253349991 is a deficient number, since it is larger than the sum of its proper divisors (1).

221253349991 is an equidigital number, since it uses as much as digits as its factorization.

221253349991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The spelling of 221253349991 in words is "two hundred twenty-one billion, two hundred fifty-three million, three hundred forty-nine thousand, nine hundred ninety-one".