21244233216 has 40 divisors (see below), whose sum is σ = 56595969144. Its totient is φ = 7081410560.

The previous prime is 21244233139. The next prime is 21244233223. The reversal of 21244233216 is 61233244212.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6913905 + ... + 6916976.

Almost surely, 2^21244233216 is an apocalyptic number.

It is an amenable number.

21244233216 is an abundant number, since it is smaller than the sum of its proper divisors (35351735928).

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

21244233216 is an equidigital number, since it uses as much as digits as its factorization.

21244233216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13830902 (or 13830886 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

Adding to 21244233216 its reverse (61233244212), we get a palindrome (82477477428).

The spelling of 21244233216 in words is "twenty-one billion, two hundred forty-four million, two hundred thirty-three thousand, two hundred sixteen".