122142400421 has 2 divisors, whose sum is σ = 122142400422. Its totient is φ = 122142400420.

The previous prime is 122142400351. The next prime is 122142400433. The reversal of 122142400421 is 124004241221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113101053025 + 9041347396 = 336305^2 + 95086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122142400421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122142400451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61071200210 + 61071200211.

It is an arithmetic number, because the mean of its divisors is an integer number (61071200211).

Almost surely, 2^122142400421 is an apocalyptic number.

It is an amenable number.

122142400421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122142400421 is an equidigital number, since it uses as much as digits as its factorization.

122142400421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 122142400421 its reverse (124004241221), we get a palindrome (246146641642).

The spelling of 122142400421 in words is "one hundred twenty-two billion, one hundred forty-two million, four hundred thousand, four hundred twenty-one".