1312233021 has 48 divisors (see below), whose sum is σ = 2186775360. Its totient is φ = 776714400.

The previous prime is 1312233011. The next prime is 1312233031. The reversal of 1312233021 is 1203322131.

1312233021 is a `hidden beast` number, since 1 + 312 + 2 + 330 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (1312233011) and next prime (1312233031).

It is not a de Polignac number, because 1312233021 - 2¹⁰ = 1312231997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312232985 and 1312233003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312233001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135811 + ... + 145151.

It is an arithmetic number, because the mean of its divisors is an integer number (45557820).

Almost surely, 2^1312233021 is an apocalyptic number.

1312233021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312233021 is a deficient number, since it is larger than the sum of its proper divisors (874542339).

1312233021 is a wasteful number, since it uses less digits than its factorization.

1312233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9415 (or 9398 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1312233021 is about 36224.7570178186. The cubic root of 1312233021 is about 1094.8055425003.

Adding to 1312233021 its reverse (1203322131), we get a palindrome (2515555152).

The spelling of 1312233021 in words is "one billion, three hundred twelve million, two hundred thirty-three thousand, twenty-one".