239721102221 has 2 divisors, whose sum is σ = 239721102222. Its totient is φ = 239721102220.

The previous prime is 239721102143. The next prime is 239721102293. The reversal of 239721102221 is 122201127932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139304365225 + 100416736996 = 373235^2 + 316886^2 .

It is a cyclic number.

It is not a de Polignac number, because 239721102221 - 2²⁶ = 239653993357 is a prime.

It is a super-2 number, since 2×239721102221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239721132221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119860551110 + 119860551111.

It is an arithmetic number, because the mean of its divisors is an integer number (119860551111).

Almost surely, 2^239721102221 is an apocalyptic number.

It is an amenable number.

239721102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

239721102221 is an equidigital number, since it uses as much as digits as its factorization.

239721102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 239721102221 in words is "two hundred thirty-nine billion, seven hundred twenty-one million, one hundred two thousand, two hundred twenty-one".