13121344220 has 24 divisors (see below), whose sum is σ = 28195634544. Its totient is φ = 5126478336.

The previous prime is 13121344207. The next prime is 13121344231. The reversal of 13121344220 is 2244312131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7627829 + ... + 7629548.

It is an arithmetic number, because the mean of its divisors is an integer number (1174818106).

Almost surely, 2^13121344220 is an apocalyptic number.

13121344220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121344220 is an abundant number, since it is smaller than the sum of its proper divisors (15074290324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13121344220 is a wasteful number, since it uses less digits than its factorization.

13121344220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15257429 (or 15257427 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 13121344220 its reverse (2244312131), we get a palindrome (15365656351).

The spelling of 13121344220 in words is "thirteen billion, one hundred twenty-one million, three hundred forty-four thousand, two hundred twenty".