12311021003 has 4 divisors (see below), whose sum is σ = 12354523128. Its totient is φ = 12267518880.

The previous prime is 12311020961. The next prime is 12311021017. The reversal of 12311021003 is 30012011321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12311021003 is a prime.

It is a super-2 number, since 2×12311021003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12311021033) 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, 21750638 + ... + 21751203.

It is an arithmetic number, because the mean of its divisors is an integer number (3088630782).

Almost surely, 2^12311021003 is an apocalyptic number.

12311021003 is a deficient number, since it is larger than the sum of its proper divisors (43502125).

12311021003 is an equidigital number, since it uses as much as digits as its factorization.

12311021003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43502124.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 12311021003 its reverse (30012011321), we get a palindrome (42323032324).

The spelling of 12311021003 in words is "twelve billion, three hundred eleven million, twenty-one thousand, three".