21233303212 has 24 divisors (see below), whose sum is σ = 42920796240. Its totient is φ = 9083765760.

The previous prime is 21233303209. The next prime is 21233303213. The reversal of 21233303212 is 21230333212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21233303213) 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, 14192637 + ... + 14194132.

It is an arithmetic number, because the mean of its divisors is an integer number (1788366510).

Almost surely, 2^21233303212 is an apocalyptic number.

21233303212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21233303212 is an abundant number, since it is smaller than the sum of its proper divisors (21687493028).

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

21233303212 is a wasteful number, since it uses less digits than its factorization.

21233303212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28386801 (or 28386799 counting only the distinct ones).

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

Adding to 21233303212 its reverse (21230333212), we get a palindrome (42463636424).

The spelling of 21233303212 in words is "twenty-one billion, two hundred thirty-three million, three hundred three thousand, two hundred twelve".