221343149 has 2 divisors, whose sum is σ = 221343150. Its totient is φ = 221343148.

The previous prime is 221343127. The next prime is 221343151. The reversal of 221343149 is 941343122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 104919049 = 10790^2 + 10243^2 .

It is a cyclic number.

It is not a de Polignac number, because 221343149 - 2²⁰ = 220294573 is a prime.

Together with 221343151, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12192419 and since 221343149 and 12192419 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221343449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110671574 + 110671575.

It is an arithmetic number, because the mean of its divisors is an integer number (110671575).

Almost surely, 2^221343149 is an apocalyptic number.

It is an amenable number.

221343149 is a deficient number, since it is larger than the sum of its proper divisors (1).

221343149 is an equidigital number, since it uses as much as digits as its factorization.

221343149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 221343149 is about 14877.6056205291. The cubic root of 221343149 is about 604.9071177675.

The spelling of 221343149 in words is "two hundred twenty-one million, three hundred forty-three thousand, one hundred forty-nine".