13120212506 has 24 divisors (see below), whose sum is σ = 21129282804. Its totient is φ = 6105274560.

The previous prime is 13120212499. The next prime is 13120212551. The reversal of 13120212506 is 60521202131.

It can be written as a sum of positive squares in 2 ways, for example, as 12675382225 + 444830281 = 112585^2 + 21091^2 .

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128435 + ... + 206726.

Almost surely, 2^13120212506 is an apocalyptic number.

13120212506 is a deficient number, since it is larger than the sum of its proper divisors (8009070298).

13120212506 is a wasteful number, since it uses less digits than its factorization.

13120212506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335246 (or 335223 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 13120212506 its reverse (60521202131), we get a palindrome (73641414637).

The spelling of 13120212506 in words is "thirteen billion, one hundred twenty million, two hundred twelve thousand, five hundred six".