221345669 has 2 divisors, whose sum is σ = 221345670. Its totient is φ = 221345668.

The previous prime is 221345659. The next prime is 221345681. The reversal of 221345669 is 966543122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198669025 + 22676644 = 14095^2 + 4762^2 .

It is a cyclic number.

It is not a de Polignac number, because 221345669 - 2⁸ = 221345413 is a prime.

It is a super-2 number, since 2×221345669² = 97987810370115122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221345659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110672834 + 110672835.

It is an arithmetic number, because the mean of its divisors is an integer number (110672835).

Almost surely, 2^221345669 is an apocalyptic number.

It is an amenable number.

221345669 is a deficient number, since it is larger than the sum of its proper divisors (1).

221345669 is an equidigital number, since it uses as much as digits as its factorization.

221345669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 221345669 is about 14877.6903113353. The cubic root of 221345669 is about 604.9094133889.

The spelling of 221345669 in words is "two hundred twenty-one million, three hundred forty-five thousand, six hundred sixty-nine".