21133204231 has 8 divisors (see below), whose sum is σ = 21490424624. Its totient is φ = 20776331520.

The previous prime is 21133204229. The next prime is 21133204247. The reversal of 21133204231 is 13240233112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21133204231 - 2¹ = 21133204229 is a prime.

It is a super-2 number, since 2×21133204231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133204201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37156 + ... + 208918.

It is an arithmetic number, because the mean of its divisors is an integer number (2686303078).

Almost surely, 2^21133204231 is an apocalyptic number.

21133204231 is a deficient number, since it is larger than the sum of its proper divisors (357220393).

21133204231 is a wasteful number, since it uses less digits than its factorization.

21133204231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173841.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21133204231 its reverse (13240233112), we get a palindrome (34373437343).

The spelling of 21133204231 in words is "twenty-one billion, one hundred thirty-three million, two hundred four thousand, two hundred thirty-one".