21213304233 has 16 divisors (see below), whose sum is σ = 30893337792. Its totient is φ = 12840872000.

The previous prime is 21213304193. The next prime is 21213304249. The reversal of 21213304233 is 33240331212.

It is not a de Polignac number, because 21213304233 - 2¹⁷ = 21213173161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213304283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364398 + ... + 418583.

It is an arithmetic number, because the mean of its divisors is an integer number (1930833612).

Almost surely, 2^21213304233 is an apocalyptic number.

It is an amenable number.

21213304233 is a deficient number, since it is larger than the sum of its proper divisors (9680033559).

21213304233 is a wasteful number, since it uses less digits than its factorization.

21213304233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783816.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21213304233 its reverse (33240331212), we get a palindrome (54453635445).

The spelling of 21213304233 in words is "twenty-one billion, two hundred thirteen million, three hundred four thousand, two hundred thirty-three".