21233210443 has 4 divisors (see below), whose sum is σ = 22482222840. Its totient is φ = 19984198048.

The previous prime is 21233210441. The next prime is 21233210473. The reversal of 21233210443 is 34401233212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21233210443 - 2¹ = 21233210441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233210441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624506173 + ... + 624506206.

It is an arithmetic number, because the mean of its divisors is an integer number (5620555710).

Almost surely, 2^21233210443 is an apocalyptic number.

21233210443 is a deficient number, since it is larger than the sum of its proper divisors (1249012397).

21233210443 is a wasteful number, since it uses less digits than its factorization.

21233210443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249012396.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21233210443 its reverse (34401233212), we get a palindrome (55634443655).

The spelling of 21233210443 in words is "twenty-one billion, two hundred thirty-three million, two hundred ten thousand, four hundred forty-three".