123522502421 has 2 divisors, whose sum is σ = 123522502422. Its totient is φ = 123522502420.

The previous prime is 123522502393. The next prime is 123522502423. The reversal of 123522502421 is 124205225321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119222421796 + 4300080625 = 345286^2 + 65575^2 .

It is a cyclic number.

It is not a de Polignac number, because 123522502421 - 2¹⁴ = 123522486037 is a prime.

It is a super-2 number, since 2×123522502421² (a number of 23 digits) contains 22 as substring.

Together with 123522502423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123522502423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61761251210 + 61761251211.

It is an arithmetic number, because the mean of its divisors is an integer number (61761251211).

Almost surely, 2^123522502421 is an apocalyptic number.

It is an amenable number.

123522502421 is a deficient number, since it is larger than the sum of its proper divisors (1).

123522502421 is an equidigital number, since it uses as much as digits as its factorization.

123522502421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 123522502421 its reverse (124205225321), we get a palindrome (247727727742).

The spelling of 123522502421 in words is "one hundred twenty-three billion, five hundred twenty-two million, five hundred two thousand, four hundred twenty-one".