1312321220 has 48 divisors (see below), whose sum is σ = 3151830528. Its totient is φ = 449616000.

The previous prime is 1312321207. The next prime is 1312321259. The reversal of 1312321220 is 221232131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273845 + ... + 278595.

It is an arithmetic number, because the mean of its divisors is an integer number (65663136).

Almost surely, 2^1312321220 is an apocalyptic number.

1312321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312321220 is an abundant number, since it is smaller than the sum of its proper divisors (1839509308).

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

1312321220 is a wasteful number, since it uses less digits than its factorization.

1312321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6740 (or 6738 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1312321220 is about 36225.9743830307. The cubic root of 1312321220 is about 1094.8300703063.

Adding to 1312321220 its reverse (221232131), we get a palindrome (1533553351).

It can be divided in two parts, 13123 and 21220, that added together give a palindrome (34343).

The spelling of 1312321220 in words is "one billion, three hundred twelve million, three hundred twenty-one thousand, two hundred twenty".