122440342421 has 2 divisors, whose sum is σ = 122440342422. Its totient is φ = 122440342420.

The previous prime is 122440342403. The next prime is 122440342441. The reversal of 122440342421 is 124243044221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104959800625 + 17480541796 = 323975^2 + 132214^2 .

It is a cyclic number.

It is not a de Polignac number, because 122440342421 - 2²² = 122436148117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122440342441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61220171210 + 61220171211.

It is an arithmetic number, because the mean of its divisors is an integer number (61220171211).

Almost surely, 2^122440342421 is an apocalyptic number.

It is an amenable number.

122440342421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122440342421 is an equidigital number, since it uses as much as digits as its factorization.

122440342421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 122440342421 its reverse (124243044221), we get a palindrome (246683386642).

The spelling of 122440342421 in words is "one hundred twenty-two billion, four hundred forty million, three hundred forty-two thousand, four hundred twenty-one".