1321013100 has 72 divisors (see below), whose sum is σ = 4169608128. Its totient is φ = 320244800.

The previous prime is 1321013093. The next prime is 1321013117. The reversal of 1321013100 is 13101231.

It is a super-2 number, since 2×1321013100² = 3490151220743220000, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196854 + ... + 203453.

It is an arithmetic number, because the mean of its divisors is an integer number (57911224).

Almost surely, 2^1321013100 is an apocalyptic number.

1321013100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321013100 is an abundant number, since it is smaller than the sum of its proper divisors (2848595028).

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

1321013100 is a wasteful number, since it uses less digits than its factorization.

1321013100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400335 (or 400328 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1321013100 is about 36345.7439048921. The cubic root of 1321013100 is about 1097.2418779888.

Adding to 1321013100 its reverse (13101231), we get a palindrome (1334114331).

The spelling of 1321013100 in words is "one billion, three hundred twenty-one million, thirteen thousand, one hundred".