21031133323 has 16 divisors (see below), whose sum is σ = 22063104000. Its totient is φ = 20009262240.

The previous prime is 21031133309. The next prime is 21031133327. The reversal of 21031133323 is 32333113012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031133323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031133294 and 21031133303.

It is not an unprimeable number, because it can be changed into a prime (21031133327) 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, 3456598 + ... + 3462676.

It is an arithmetic number, because the mean of its divisors is an integer number (1378944000).

Almost surely, 2^21031133323 is an apocalyptic number.

21031133323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21031133323 is a deficient number, since it is larger than the sum of its proper divisors (1031970677).

21031133323 is a wasteful number, since it uses less digits than its factorization.

21031133323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21031133323 its reverse (32333113012), we get a palindrome (53364246335).

The spelling of 21031133323 in words is "twenty-one billion, thirty-one million, one hundred thirty-three thousand, three hundred twenty-three".