122751612421 has 4 divisors (see below), whose sum is σ = 128088639072. Its totient is φ = 117414585772.

The previous prime is 122751612419. The next prime is 122751612449. The reversal of 122751612421 is 124216157221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122751612421 - 2¹ = 122751612419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122751612121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668513291 + ... + 2668513336.

It is an arithmetic number, because the mean of its divisors is an integer number (32022159768).

Almost surely, 2^122751612421 is an apocalyptic number.

It is an amenable number.

122751612421 is a deficient number, since it is larger than the sum of its proper divisors (5337026651).

122751612421 is an equidigital number, since it uses as much as digits as its factorization.

122751612421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337026650.

The product of its digits is 13440, while the sum is 34.

Adding to 122751612421 its reverse (124216157221), we get a palindrome (246967769642).

The spelling of 122751612421 in words is "one hundred twenty-two billion, seven hundred fifty-one million, six hundred twelve thousand, four hundred twenty-one".