21131323003 has 16 divisors (see below), whose sum is σ = 24684168960. Its totient is φ = 17715118176.

The previous prime is 21131322977. The next prime is 21131323007. The reversal of 21131323003 is 30032313112.

It is a de Polignac number, because none of the positive numbers 2^k-21131323003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131323007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48501 + ... + 211222.

It is an arithmetic number, because the mean of its divisors is an integer number (1542760560).

Almost surely, 2^21131323003 is an apocalyptic number.

21131323003 is a deficient number, since it is larger than the sum of its proper divisors (3552845957).

21131323003 is a wasteful number, since it uses less digits than its factorization.

21131323003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259986.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21131323003 its reverse (30032313112), we get a palindrome (51163636115).

The spelling of 21131323003 in words is "twenty-one billion, one hundred thirty-one million, three hundred twenty-three thousand, three".