1321113400 has 48 divisors (see below), whose sum is σ = 3083943240. Its totient is φ = 526320000.

The previous prime is 1321113373. The next prime is 1321113421. The reversal of 1321113400 is 43111231.

It is a congruent number.

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, 37042 + ... + 63358.

Almost surely, 2^1321113400 is an apocalyptic number.

1321113400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321113400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541971620).

1321113400 is an abundant number, since it is smaller than the sum of its proper divisors (1762829840).

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

1321113400 is a wasteful number, since it uses less digits than its factorization.

1321113400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26584 (or 26575 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321113400 is about 36347.1236826245. The cubic root of 1321113400 is about 1097.2696472252.

Adding to 1321113400 its reverse (43111231), we get a palindrome (1364224631).

The spelling of 1321113400 in words is "one billion, three hundred twenty-one million, one hundred thirteen thousand, four hundred".