1312220100 has 72 divisors (see below), whose sum is σ = 3800499808. Its totient is φ = 349574400.

The previous prime is 1312220093. The next prime is 1312220141. The reversal of 1312220100 is 10222131.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457872 + ... + 460728.

Almost surely, 2^1312220100 is an apocalyptic number.

1312220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312220100 is an abundant number, since it is smaller than the sum of its proper divisors (2488279708).

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

1312220100 is a wasteful number, since it uses less digits than its factorization.

1312220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405 (or 4398 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1312220100 is about 36224.5786724980. The cubic root of 1312220100 is about 1094.8019491271.

Adding to 1312220100 its reverse (10222131), we get a palindrome (1322442231).

The spelling of 1312220100 in words is "one billion, three hundred twelve million, two hundred twenty thousand, one hundred".