122607721 has 2 divisors, whose sum is σ = 122607722. Its totient is φ = 122607720.

The previous prime is 122607673. The next prime is 122607731. The reversal of 122607721 is 127706221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120758121 + 1849600 = 10989^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 122607721 - 2²³ = 114219113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122607721.

It is not a weakly prime, because it can be changed into another prime (122607731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61303860 + 61303861.

It is an arithmetic number, because the mean of its divisors is an integer number (61303861).

Almost surely, 2^122607721 is an apocalyptic number.

It is an amenable number.

122607721 is a deficient number, since it is larger than the sum of its proper divisors (1).

122607721 is an equidigital number, since it uses as much as digits as its factorization.

122607721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 122607721 is about 11072.8370799899. The cubic root of 122607721 is about 496.7897270750.

The spelling of 122607721 in words is "one hundred twenty-two million, six hundred seven thousand, seven hundred twenty-one".