221442937 has 2 divisors, whose sum is σ = 221442938. Its totient is φ = 221442936.

The previous prime is 221442911. The next prime is 221442959. The reversal of 221442937 is 739244122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198556281 + 22886656 = 14091^2 + 4784^2 .

It is a cyclic number.

It is not a de Polignac number, because 221442937 - 2²⁷ = 87225209 is a prime.

It is not a weakly prime, because it can be changed into another prime (221442997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110721468 + 110721469.

It is an arithmetic number, because the mean of its divisors is an integer number (110721469).

Almost surely, 2^221442937 is an apocalyptic number.

It is an amenable number.

221442937 is a deficient number, since it is larger than the sum of its proper divisors (1).

221442937 is an equidigital number, since it uses as much as digits as its factorization.

221442937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 221442937 is about 14880.9588736748. The cubic root of 221442937 is about 604.9980074155.

The spelling of 221442937 in words is "two hundred twenty-one million, four hundred forty-two thousand, nine hundred thirty-seven".