21031000323 has 4 divisors (see below), whose sum is σ = 28041333768. Its totient is φ = 14020666880.

The previous prime is 21031000283. The next prime is 21031000351. The reversal of 21031000323 is 32300013012.

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

It is a cyclic number.

It is not a de Polignac number, because 21031000323 - 2¹² = 21030996227 is a prime.

It is a super-2 number, since 2×21031000323² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031000223) 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, 3505166718 + ... + 3505166723.

It is an arithmetic number, because the mean of its divisors is an integer number (7010333442).

Almost surely, 2^21031000323 is an apocalyptic number.

21031000323 is a deficient number, since it is larger than the sum of its proper divisors (7010333445).

21031000323 is an equidigital number, since it uses as much as digits as its factorization.

21031000323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010333444.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21031000323 its reverse (32300013012), we get a palindrome (53331013335).

The spelling of 21031000323 in words is "twenty-one billion, thirty-one million, three hundred twenty-three", and thus it is an aban number.