221498369 has 2 divisors, whose sum is σ = 221498370. Its totient is φ = 221498368.

The previous prime is 221498339. The next prime is 221498401. The reversal of 221498369 is 963894122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177209344 + 44289025 = 13312^2 + 6655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221498369 is a prime.

It is a super-2 number, since 2×221498369² = 98123054939320322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221498309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110749184 + 110749185.

It is an arithmetic number, because the mean of its divisors is an integer number (110749185).

Almost surely, 2^221498369 is an apocalyptic number.

It is an amenable number.

221498369 is a deficient number, since it is larger than the sum of its proper divisors (1).

221498369 is an equidigital number, since it uses as much as digits as its factorization.

221498369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 221498369 is about 14882.8212715197. The cubic root of 221498369 is about 605.0484846056.

The spelling of 221498369 in words is "two hundred twenty-one million, four hundred ninety-eight thousand, three hundred sixty-nine".