21303243033 has 4 divisors (see below), whose sum is σ = 28404324048. Its totient is φ = 14202162020.

The previous prime is 21303243001. The next prime is 21303243037. The reversal of 21303243033 is 33034230312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21303243033 - 2⁵ = 21303243001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21303242994 and 21303243012.

It is not an unprimeable number, because it can be changed into a prime (21303243037) 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, 3550540503 + ... + 3550540508.

It is an arithmetic number, because the mean of its divisors is an integer number (7101081012).

Almost surely, 2^21303243033 is an apocalyptic number.

It is an amenable number.

21303243033 is a deficient number, since it is larger than the sum of its proper divisors (7101081015).

21303243033 is an equidigital number, since it uses as much as digits as its factorization.

21303243033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7101081014.

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21303243033 its reverse (33034230312), we get a palindrome (54337473345).

The spelling of 21303243033 in words is "twenty-one billion, three hundred three million, two hundred forty-three thousand, thirty-three".