21221100032 has 120 divisors (see below), whose sum is σ = 47178730368. Its totient is φ = 9527429120.

The previous prime is 21221100031. The next prime is 21221100067. The reversal of 21221100032 is 23000112212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21221100031) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5139953 + ... + 5144079.

Almost surely, 2^21221100032 is an apocalyptic number.

21221100032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221100032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23589365184).

21221100032 is an abundant number, since it is smaller than the sum of its proper divisors (25957630336).

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

21221100032 is an equidigital number, since it uses as much as digits as its factorization.

21221100032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250 (or 4223 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21221100032 its reverse (23000112212), we get a palindrome (44221212244).

The spelling of 21221100032 in words is "twenty-one billion, two hundred twenty-one million, one hundred thousand, thirty-two".