21240201233 has 8 divisors (see below), whose sum is σ = 21443143680. Its totient is φ = 21037816800.

The previous prime is 21240201187. The next prime is 21240201247. The reversal of 21240201233 is 33210204212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240201233 is a prime.

It is a super-2 number, since 2×21240201233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21240201133) 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, 62813 + ... + 215466.

It is an arithmetic number, because the mean of its divisors is an integer number (2680392960).

Almost surely, 2^21240201233 is an apocalyptic number.

It is an amenable number.

21240201233 is a deficient number, since it is larger than the sum of its proper divisors (202942447).

21240201233 is a wasteful number, since it uses less digits than its factorization.

21240201233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279007.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21240201233 its reverse (33210204212), we get a palindrome (54450405445).

The spelling of 21240201233 in words is "twenty-one billion, two hundred forty million, two hundred one thousand, two hundred thirty-three".