21230113233 has 12 divisors (see below), whose sum is σ = 32928339120. Its totient is φ = 12131493192.

The previous prime is 21230113231. The next prime is 21230113243. The reversal of 21230113233 is 33231103212.

It is not a de Polignac number, because 21230113233 - 2¹ = 21230113231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21230113231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72211123 + ... + 72211416.

It is an arithmetic number, because the mean of its divisors is an integer number (2744028260).

Almost surely, 2^21230113233 is an apocalyptic number.

It is an amenable number.

21230113233 is a deficient number, since it is larger than the sum of its proper divisors (11698225887).

21230113233 is a wasteful number, since it uses less digits than its factorization.

21230113233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144422556 (or 144422549 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21230113233 its reverse (33231103212), we get a palindrome (54461216445).

The spelling of 21230113233 in words is "twenty-one billion, two hundred thirty million, one hundred thirteen thousand, two hundred thirty-three".