122721413 has 2 divisors, whose sum is σ = 122721414. Its totient is φ = 122721412.

The previous prime is 122721407. The next prime is 122721457. The reversal of 122721413 is 314127221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98446084 + 24275329 = 9922^2 + 4927^2 .

It is a cyclic number.

It is not a de Polignac number, because 122721413 - 2¹⁴ = 122705029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122721463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61360706 + 61360707.

It is an arithmetic number, because the mean of its divisors is an integer number (61360707).

Almost surely, 2^122721413 is an apocalyptic number.

It is an amenable number.

122721413 is a deficient number, since it is larger than the sum of its proper divisors (1).

122721413 is an equidigital number, since it uses as much as digits as its factorization.

122721413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 122721413 is about 11077.9697147086. The cubic root of 122721413 is about 496.9432344512.

Adding to 122721413 its reverse (314127221), we get a palindrome (436848634).

The spelling of 122721413 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, four hundred thirteen".