21333211212 has 24 divisors (see below), whose sum is σ = 51122831536. Its totient is φ = 6918879168.

The previous prime is 21333211187. The next prime is 21333211297. The reversal of 21333211212 is 21211233312.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24023443 + ... + 24024330.

Almost surely, 2^21333211212 is an apocalyptic number.

It is an amenable number.

21333211212 is an abundant number, since it is smaller than the sum of its proper divisors (29789620324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21333211212 is a wasteful number, since it uses less digits than its factorization.

21333211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48047817 (or 48047815 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 21333211212 its reverse (21211233312), we get a palindrome (42544444524).

The spelling of 21333211212 in words is "twenty-one billion, three hundred thirty-three million, two hundred eleven thousand, two hundred twelve".