21022133220 has 72 divisors (see below), whose sum is σ = 69564156480. Its totient is φ = 5096274240.

The previous prime is 21022133213. The next prime is 21022133299. The reversal of 21022133220 is 2233122012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21022133193 and 21022133202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5306640 + ... + 5310599.

It is an arithmetic number, because the mean of its divisors is an integer number (966168840).

Almost surely, 2^21022133220 is an apocalyptic number.

21022133220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022133220 is an abundant number, since it is smaller than the sum of its proper divisors (48542023260).

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

21022133220 is a wasteful number, since it uses less digits than its factorization.

21022133220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617265 (or 10617260 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21022133220 its reverse (2233122012), we get a palindrome (23255255232).

The spelling of 21022133220 in words is "twenty-one billion, twenty-two million, one hundred thirty-three thousand, two hundred twenty".