123235115421 has 64 divisors (see below), whose sum is σ = 185604286464. Its totient is φ = 72091219200.

The previous prime is 123235115413. The next prime is 123235115447. The reversal of 123235115421 is 124511532321.

It is a happy number.

It is not a de Polignac number, because 123235115421 - 2³ = 123235115413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123235115411) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84813531 + ... + 84814983.

It is an arithmetic number, because the mean of its divisors is an integer number (2900066976).

Almost surely, 2^123235115421 is an apocalyptic number.

123235115421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123235115421 is a deficient number, since it is larger than the sum of its proper divisors (62369171043).

123235115421 is a wasteful number, since it uses less digits than its factorization.

123235115421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274.

The product of its digits is 7200, while the sum is 30.

Adding to 123235115421 its reverse (124511532321), we get a palindrome (247746647742).

The spelling of 123235115421 in words is "one hundred twenty-three billion, two hundred thirty-five million, one hundred fifteen thousand, four hundred twenty-one".