21243004233 has 16 divisors (see below), whose sum is σ = 31022030592. Its totient is φ = 12823250000.

The previous prime is 21243004219. The next prime is 21243004241. The reversal of 21243004233 is 33240034212.

It is not a de Polignac number, because 21243004233 - 2⁹ = 21243003721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21245004233) 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, 1274043 + ... + 1290608.

It is an arithmetic number, because the mean of its divisors is an integer number (1938876912).

Almost surely, 2^21243004233 is an apocalyptic number.

It is an amenable number.

21243004233 is a deficient number, since it is larger than the sum of its proper divisors (9779026359).

21243004233 is a wasteful number, since it uses less digits than its factorization.

21243004233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564916.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21243004233 its reverse (33240034212), we get a palindrome (54483038445).

The spelling of 21243004233 in words is "twenty-one billion, two hundred forty-three million, four thousand, two hundred thirty-three".