21212023333 has 8 divisors (see below), whose sum is σ = 21439827576. Its totient is φ = 20984568000.

The previous prime is 21212023331. The next prime is 21212023361. The reversal of 21212023333 is 33332021212.

It can be written as a sum of positive squares in 4 ways, for example, as 7080044449 + 14131978884 = 84143^2 + 118878^2 .

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

It is not a de Polignac number, because 21212023333 - 2¹ = 21212023331 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212023331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35943 + ... + 209083.

It is an arithmetic number, because the mean of its divisors is an integer number (2679978447).

Almost surely, 2^21212023333 is an apocalyptic number.

It is an amenable number.

21212023333 is a deficient number, since it is larger than the sum of its proper divisors (227804243).

21212023333 is a wasteful number, since it uses less digits than its factorization.

21212023333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174455.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21212023333 its reverse (33332021212), we get a palindrome (54544044545).

The spelling of 21212023333 in words is "twenty-one billion, two hundred twelve million, twenty-three thousand, three hundred thirty-three".