13215015123 has 4 divisors (see below), whose sum is σ = 17620020168. Its totient is φ = 8810010080.

The previous prime is 13215015101. The next prime is 13215015137. The reversal of 13215015123 is 32151051231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13215015123 - 2⁵ = 13215015091 is a prime.

It is a super-2 number, since 2×13215015123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13215015093 and 13215015102.

It is not an unprimeable number, because it can be changed into a prime (13215015193) 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, 2202502518 + ... + 2202502523.

It is an arithmetic number, because the mean of its divisors is an integer number (4405005042).

Almost surely, 2^13215015123 is an apocalyptic number.

13215015123 is a deficient number, since it is larger than the sum of its proper divisors (4405005045).

13215015123 is an equidigital number, since it uses as much as digits as its factorization.

13215015123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405005044.

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 13215015123 its reverse (32151051231), we get a palindrome (45366066354).

The spelling of 13215015123 in words is "thirteen billion, two hundred fifteen million, fifteen thousand, one hundred twenty-three".