221318013149 has 2 divisors, whose sum is σ = 221318013150. Its totient is φ = 221318013148.

The previous prime is 221318013143. The next prime is 221318013181. The reversal of 221318013149 is 941310813122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212745105049 + 8572908100 = 461243^2 + 92590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221318013149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221318013143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110659006574 + 110659006575.

It is an arithmetic number, because the mean of its divisors is an integer number (110659006575).

Almost surely, 2^221318013149 is an apocalyptic number.

It is an amenable number.

221318013149 is a deficient number, since it is larger than the sum of its proper divisors (1).

221318013149 is an equidigital number, since it uses as much as digits as its factorization.

221318013149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 221318013149 in words is "two hundred twenty-one billion, three hundred eighteen million, thirteen thousand, one hundred forty-nine".