221937013 has 2 divisors, whose sum is σ = 221937014. Its totient is φ = 221937012.

The previous prime is 221936999. The next prime is 221937017. The reversal of 221937013 is 310739122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118853604 + 103083409 = 10902^2 + 10153^2 .

It is a cyclic number.

It is not a de Polignac number, because 221937013 - 2⁹ = 221936501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221937017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110968506 + 110968507.

It is an arithmetic number, because the mean of its divisors is an integer number (110968507).

Almost surely, 2^221937013 is an apocalyptic number.

It is an amenable number.

221937013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221937013 is an equidigital number, since it uses as much as digits as its factorization.

221937013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 221937013 is about 14897.5505704797. The cubic root of 221937013 is about 605.4476235635.

The spelling of 221937013 in words is "two hundred twenty-one million, nine hundred thirty-seven thousand, thirteen".