123421513 has 4 divisors (see below), whose sum is σ = 130681620. Its totient is φ = 116161408.

The previous prime is 123421499. The next prime is 123421523. The reversal of 123421513 is 315124321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315124321 = 6043 ⋅52147.

It can be written as a sum of positive squares in 2 ways, for example, as 113486409 + 9935104 = 10653^2 + 3152^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123421513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123421523) 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, 3630028 + ... + 3630061.

It is an arithmetic number, because the mean of its divisors is an integer number (32670405).

Almost surely, 2^123421513 is an apocalyptic number.

It is an amenable number.

123421513 is a deficient number, since it is larger than the sum of its proper divisors (7260107).

123421513 is an equidigital number, since it uses as much as digits as its factorization.

123421513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260106.

The product of its digits is 720, while the sum is 22.

The square root of 123421513 is about 11109.5235271365. The cubic root of 123421513 is about 497.8864288899.

Adding to 123421513 its reverse (315124321), we get a palindrome (438545834).

The spelling of 123421513 in words is "one hundred twenty-three million, four hundred twenty-one thousand, five hundred thirteen".