1312021120 has 32 divisors (see below), whose sum is σ = 3136552020. Its totient is φ = 524808192.

The previous prime is 1312021097. The next prime is 1312021229. The reversal of 1312021120 is 211202131.

It can be written as a sum of positive squares in 2 ways, for example, as 1111288896 + 200732224 = 33336^2 + 14168^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1312021120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1024377 + ... + 1025656.

Almost surely, 2^1312021120 is an apocalyptic number.

1312021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312021120 is an abundant number, since it is smaller than the sum of its proper divisors (1824530900).

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

1312021120 is an equidigital number, since it uses as much as digits as its factorization.

1312021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050052 (or 2050040 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1312021120 is about 36221.8320906052. The cubic root of 1312021120 is about 1094.7466091467.

Adding to 1312021120 its reverse (211202131), we get a palindrome (1523223251).

The spelling of 1312021120 in words is "one billion, three hundred twelve million, twenty-one thousand, one hundred twenty".