21233213220 has 24 divisors (see below), whose sum is σ = 59452997184. Its totient is φ = 5662190176.

The previous prime is 21233213201. The next prime is 21233213233. The reversal of 21233213220 is 2231233212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176943384 + ... + 176943503.

It is an arithmetic number, because the mean of its divisors is an integer number (2477208216).

Almost surely, 2^21233213220 is an apocalyptic number.

21233213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233213220 is an abundant number, since it is smaller than the sum of its proper divisors (38219783964).

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

21233213220 is a wasteful number, since it uses less digits than its factorization.

21233213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353886899 (or 353886897 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21233213220 its reverse (2231233212), we get a palindrome (23464446432).

The spelling of 21233213220 in words is "twenty-one billion, two hundred thirty-three million, two hundred thirteen thousand, two hundred twenty".