21033302243 has 16 divisors (see below), whose sum is σ = 21617627136. Its totient is φ = 20455044480.

The previous prime is 21033302239. The next prime is 21033302249. The reversal of 21033302243 is 34220333012.

It is a cyclic number.

It is not a de Polignac number, because 21033302243 - 2² = 21033302239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033302249) 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, 6737723 + ... + 6740843.

It is an arithmetic number, because the mean of its divisors is an integer number (1351101696).

Almost surely, 2^21033302243 is an apocalyptic number.

21033302243 is a deficient number, since it is larger than the sum of its proper divisors (584324893).

21033302243 is a wasteful number, since it uses less digits than its factorization.

21033302243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21033302243 its reverse (34220333012), we get a palindrome (55253635255).

The spelling of 21033302243 in words is "twenty-one billion, thirty-three million, three hundred two thousand, two hundred forty-three".