1312221300 has 144 divisors (see below), whose sum is σ = 4266810240. Its totient is φ = 308943360.

The previous prime is 1312221259. The next prime is 1312221311. The reversal of 1312221300 is 31222131.

1312221300 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1312221300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82386 + ... + 97014.

Almost surely, 2^1312221300 is an apocalyptic number.

1312221300 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 1312221300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2133405120).

1312221300 is an abundant number, since it is smaller than the sum of its proper divisors (2954588940).

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

1312221300 is a wasteful number, since it uses less digits than its factorization.

1312221300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14682 (or 14675 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1312221300 is about 36224.5952358339. The cubic root of 1312221300 is about 1094.8022828521.

Adding to 1312221300 its reverse (31222131), we get a palindrome (1343443431).

The spelling of 1312221300 in words is "one billion, three hundred twelve million, two hundred twenty-one thousand, three hundred".