1312312021 has 8 divisors (see below), whose sum is σ = 1331467200. Its totient is φ = 1293188832.

The previous prime is 1312311983. The next prime is 1312312033. The reversal of 1312312021 is 1202132131.

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-1312312021 is a prime.

It is a super-2 number, since 2×1312312021² = 3444325680922208882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312311986 and 1312312004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312312091) 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, 81930 + ... + 96628.

It is an arithmetic number, because the mean of its divisors is an integer number (166433400).

Almost surely, 2^1312312021 is an apocalyptic number.

It is an amenable number.

1312312021 is a deficient number, since it is larger than the sum of its proper divisors (19155179).

1312312021 is a wasteful number, since it uses less digits than its factorization.

1312312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15995.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1312312021 is about 36225.8474158991. The cubic root of 1312312021 is about 1094.8275121507.

Adding to 1312312021 its reverse (1202132131), we get a palindrome (2514444152).

The spelling of 1312312021 in words is "one billion, three hundred twelve million, three hundred twelve thousand, twenty-one".