11312012321 has 4 divisors (see below), whose sum is σ = 11394581892. Its totient is φ = 11229442752.

The previous prime is 11312012303. The next prime is 11312012419. The reversal of 11312012321 is 12321021311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12321021311 = 8731 ⋅1411181.

It can be written as a sum of positive squares in 2 ways, for example, as 3012802321 + 8299210000 = 54889^2 + 91100^2 .

It is a cyclic number.

It is not a de Polignac number, because 11312012321 - 2²² = 11307818017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11312012321.

It is not an unprimeable number, because it can be changed into a prime (11312012821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41284580 + ... + 41284853.

It is an arithmetic number, because the mean of its divisors is an integer number (2848645473).

Almost surely, 2^11312012321 is an apocalyptic number.

It is an amenable number.

11312012321 is a deficient number, since it is larger than the sum of its proper divisors (82569571).

11312012321 is an equidigital number, since it uses as much as digits as its factorization.

11312012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82569570.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11312012321 its reverse (12321021311), we get a palindrome (23633033632).

The spelling of 11312012321 in words is "eleven billion, three hundred twelve million, twelve thousand, three hundred twenty-one".