13021220100 has 72 divisors (see below), whose sum is σ = 43056841408. Its totient is φ = 2976278400.

The previous prime is 13021220083. The next prime is 13021220101. The reversal of 13021220100 is 102212031.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (13021220101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3098191 + ... + 3102390.

Almost surely, 2^13021220100 is an apocalyptic number.

13021220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13021220100 is an abundant number, since it is smaller than the sum of its proper divisors (30035621308).

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

13021220100 is a wasteful number, since it uses less digits than its factorization.

13021220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200605 (or 6200598 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 13021220100 its reverse (102212031), we get a palindrome (13123432131).

The spelling of 13021220100 in words is "thirteen billion, twenty-one million, two hundred twenty thousand, one hundred".