1312221400 has 96 divisors (see below), whose sum is σ = 3571958880. Its totient is φ = 438912000.

The previous prime is 1312221389. The next prime is 1312221403. The reversal of 1312221400 is 41222131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312221403) 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, 45970 + ... + 68830.

It is an arithmetic number, because the mean of its divisors is an integer number (37207905).

Almost surely, 2^1312221400 is an apocalyptic number.

1312221400 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 1312221400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1785979440).

1312221400 is an abundant number, since it is smaller than the sum of its proper divisors (2259737480).

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

1312221400 is a wasteful number, since it uses less digits than its factorization.

1312221400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22925 (or 22916 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1312221400 is about 36224.5966161115. The cubic root of 1312221400 is about 1094.8023106625.

Adding to 1312221400 its reverse (41222131), we get a palindrome (1353443531).

The spelling of 1312221400 in words is "one billion, three hundred twelve million, two hundred twenty-one thousand, four hundred".