1312244021 has 8 divisors (see below), whose sum is σ = 1432733664. Its totient is φ = 1191953520.

The previous prime is 1312243993. The next prime is 1312244039. The reversal of 1312244021 is 1204422131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312244021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312243984 and 1312244002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312247021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35831 + ... + 62516.

It is an arithmetic number, because the mean of its divisors is an integer number (179091708).

Almost surely, 2^1312244021 is an apocalyptic number.

1312244021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312244021 is a deficient number, since it is larger than the sum of its proper divisors (120489643).

1312244021 is a wasteful number, since it uses less digits than its factorization.

1312244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99571.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1312244021 is about 36224.9088473663. The cubic root of 1312244021 is about 1094.8086016184.

Adding to 1312244021 its reverse (1204422131), we get a palindrome (2516666152).

The spelling of 1312244021 in words is "one billion, three hundred twelve million, two hundred forty-four thousand, twenty-one".