21213423333 has 12 divisors (see below), whose sum is σ = 30677293920. Its totient is φ = 14125813416.

The previous prime is 21213423331. The next prime is 21213423337. The reversal of 21213423333 is 33332431212.

21213423333 is a `hidden beast` number, since 21 + 213 + 423 + 3 + 3 + 3 = 666.

It is not a de Polignac number, because 21213423333 - 2¹ = 21213423331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213423297 and 21213423306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213423331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1364241 + ... + 1379702.

It is an arithmetic number, because the mean of its divisors is an integer number (2556441160).

Almost surely, 2^21213423333 is an apocalyptic number.

It is an amenable number.

21213423333 is a deficient number, since it is larger than the sum of its proper divisors (9463870587).

21213423333 is a wasteful number, since it uses less digits than its factorization.

21213423333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744808 (or 2744805 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

Adding to 21213423333 its reverse (33332431212), we get a palindrome (54545854545).

The spelling of 21213423333 in words is "twenty-one billion, two hundred thirteen million, four hundred twenty-three thousand, three hundred thirty-three".