221370713 has 2 divisors, whose sum is σ = 221370714. Its totient is φ = 221370712.

The previous prime is 221370701. The next prime is 221370731. The reversal of 221370713 is 317073122.

Together with next prime (221370731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217031824 + 4338889 = 14732^2 + 2083^2 .

It is a cyclic number.

It is not a de Polignac number, because 221370713 - 2²⁴ = 204593497 is a prime.

It is not a weakly prime, because it can be changed into another prime (221370013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110685356 + 110685357.

It is an arithmetic number, because the mean of its divisors is an integer number (110685357).

Almost surely, 2^221370713 is an apocalyptic number.

It is an amenable number.

221370713 is a deficient number, since it is larger than the sum of its proper divisors (1).

221370713 is an equidigital number, since it uses as much as digits as its factorization.

221370713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 221370713 is about 14878.5319504311. The cubic root of 221370713 is about 604.9322265452.

The spelling of 221370713 in words is "two hundred twenty-one million, three hundred seventy thousand, seven hundred thirteen".