1321111400 has 48 divisors (see below), whose sum is σ = 3510385440. Its totient is φ = 452952000.

The previous prime is 1321111399. The next prime is 1321111423. The reversal of 1321111400 is 41111231.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 470426 + ... + 473225.

It is an arithmetic number, because the mean of its divisors is an integer number (73133030).

Almost surely, 2^1321111400 is an apocalyptic number.

1321111400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321111400 is an abundant number, since it is smaller than the sum of its proper divisors (2189274040).

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

1321111400 is a wasteful number, since it uses less digits than its factorization.

1321111400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943674 (or 943665 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1321111400 is about 36347.0961701207. The cubic root of 1321111400 is about 1097.2690935154.

Adding to 1321111400 its reverse (41111231), we get a palindrome (1362222631).

The spelling of 1321111400 in words is "one billion, three hundred twenty-one million, one hundred eleven thousand, four hundred".