21212420233 has 8 divisors (see below), whose sum is σ = 21286504640. Its totient is φ = 21138440400.

The previous prime is 21212420231. The next prime is 21212420267. The reversal of 21212420233 is 33202421212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212420233 - 2¹ = 21212420231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212420231) 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 7 ways as a sum of consecutive naturals, for example, 391828 + ... + 442666.

It is an arithmetic number, because the mean of its divisors is an integer number (2660813080).

Almost surely, 2^21212420233 is an apocalyptic number.

It is an amenable number.

21212420233 is a deficient number, since it is larger than the sum of its proper divisors (74084407).

21212420233 is a wasteful number, since it uses less digits than its factorization.

21212420233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52287.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21212420233 its reverse (33202421212), we get a palindrome (54414841445).

The spelling of 21212420233 in words is "twenty-one billion, two hundred twelve million, four hundred twenty thousand, two hundred thirty-three".