1213320232100 has 18 divisors (see below), whose sum is σ = 2632904903874. Its totient is φ = 485328092800.

The previous prime is 1213320232073. The next prime is 1213320232109. The reversal of 1213320232100 is 12320233121.

It can be written as a sum of positive squares in 3 ways, for example, as 9331946404 + 1203988285696 = 96602^2 + 1097264^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1213320232109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6066601061 + ... + 6066601260.

Almost surely, 2^{1213320232100} is an apocalyptic number.

1213320232100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213320232100 is an abundant number, since it is smaller than the sum of its proper divisors (1419584671774).

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

1213320232100 is a wasteful number, since it uses less digits than its factorization.

1213320232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133202335 (or 12133202328 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1213320232100 its reverse (12320233121), we get a palindrome (1225640465221).

The spelling of 1213320232100 in words is "one trillion, two hundred thirteen billion, three hundred twenty million, two hundred thirty-two thousand, one hundred".