21233331312 has 40 divisors (see below), whose sum is σ = 54881773056. Its totient is φ = 7074035136.

The previous prime is 21233331293. The next prime is 21233331349. The reversal of 21233331312 is 21313333212.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a congruent number.

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, 24448 + ... + 207519.

Almost surely, 2^21233331312 is an apocalyptic number.

It is an amenable number.

21233331312 is an abundant number, since it is smaller than the sum of its proper divisors (33648441744).

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

21233331312 is a wasteful number, since it uses less digits than its factorization.

21233331312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233885 (or 233879 counting only the distinct ones).

The product of its digits is 1944, while the sum is 24.

Adding to 21233331312 its reverse (21313333212), we get a palindrome (42546664524).

The spelling of 21233331312 in words is "twenty-one billion, two hundred thirty-three million, three hundred thirty-one thousand, three hundred twelve".