1312121300 has 144 divisors (see below), whose sum is σ = 3347369088. Its totient is φ = 437184000.

The previous prime is 1312121299. The next prime is 1312121303. The reversal of 1312121300 is 31212131.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312121303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4736762 + ... + 4737038.

Almost surely, 2^1312121300 is an apocalyptic number.

1312121300 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 1312121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1673684544).

1312121300 is an abundant number, since it is smaller than the sum of its proper divisors (2035247788).

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

1312121300 is a wasteful number, since it uses less digits than its factorization.

1312121300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1312121300 is about 36223.2149318638. The cubic root of 1312121300 is about 1094.7744717379.

Adding to 1312121300 its reverse (31212131), we get a palindrome (1343333431).

The spelling of 1312121300 in words is "one billion, three hundred twelve million, one hundred twenty-one thousand, three hundred".