13221212100 has 36 divisors (see below), whose sum is σ = 38253374544. Its totient is φ = 3525656480.

The previous prime is 13221212057. The next prime is 13221212113. The reversal of 13221212100 is 121212231.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 13221212100.

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, 22035054 + ... + 22035653.

Almost surely, 2^13221212100 is an apocalyptic number.

13221212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13221212100 is an abundant number, since it is smaller than the sum of its proper divisors (25032162444).

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

13221212100 is a wasteful number, since it uses less digits than its factorization.

13221212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44070724 (or 44070717 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 13221212100 its reverse (121212231), we get a palindrome (13342424331).

The spelling of 13221212100 in words is "thirteen billion, two hundred twenty-one million, two hundred twelve thousand, one hundred".