21043354233 has 16 divisors (see below), whose sum is σ = 31320343296. Its totient is φ = 12456953040.

The previous prime is 21043354231. The next prime is 21043354243. The reversal of 21043354233 is 33245334012.

It is not a de Polignac number, because 21043354233 - 2¹ = 21043354231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21043354233.

It is not an unprimeable number, because it can be changed into a prime (21043354231) 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, 7413435 + ... + 7416272.

It is an arithmetic number, because the mean of its divisors is an integer number (1957521456).

Almost surely, 2^21043354233 is an apocalyptic number.

It is an amenable number.

21043354233 is a deficient number, since it is larger than the sum of its proper divisors (10276989063).

21043354233 is a wasteful number, since it uses less digits than its factorization.

21043354233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14829764.

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 21043354233 its reverse (33245334012), we get a palindrome (54288688245).

The spelling of 21043354233 in words is "twenty-one billion, forty-three million, three hundred fifty-four thousand, two hundred thirty-three".