221993574713 has 2 divisors, whose sum is σ = 221993574714. Its totient is φ = 221993574712.

The previous prime is 221993574613. The next prime is 221993574721. The reversal of 221993574713 is 317475399122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203304497449 + 18689077264 = 450893^2 + 136708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221993574713 is a prime.

It is a super-2 number, since 2×221993574713² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221993574763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110996787356 + 110996787357.

It is an arithmetic number, because the mean of its divisors is an integer number (110996787357).

Almost surely, 2^221993574713 is an apocalyptic number.

It is an amenable number.

221993574713 is a deficient number, since it is larger than the sum of its proper divisors (1).

221993574713 is an equidigital number, since it uses as much as digits as its factorization.

221993574713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 53.

The spelling of 221993574713 in words is "two hundred twenty-one billion, nine hundred ninety-three million, five hundred seventy-four thousand, seven hundred thirteen".