201220721239 has 2 divisors, whose sum is σ = 201220721240. Its totient is φ = 201220721238.

The previous prime is 201220721231. The next prime is 201220721243. The reversal of 201220721239 is 932127022102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201220721239 - 2³ = 201220721231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201220721239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201220721231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610360619 + 100610360620.

It is an arithmetic number, because the mean of its divisors is an integer number (100610360620).

Almost surely, 2^201220721239 is an apocalyptic number.

201220721239 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220721239 is an equidigital number, since it uses as much as digits as its factorization.

201220721239 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 31.

The spelling of 201220721239 in words is "two hundred one billion, two hundred twenty million, seven hundred twenty-one thousand, two hundred thirty-nine".