21222033420 has 96 divisors (see below), whose sum is σ = 67982035968. Its totient is φ = 4845641472.

The previous prime is 21222033401. The next prime is 21222033421. The reversal of 21222033420 is 2433022212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21222033421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380014 + ... + 432266.

It is an arithmetic number, because the mean of its divisors is an integer number (708146208).

Almost surely, 2^21222033420 is an apocalyptic number.

21222033420 is a gapful number since it is divisible by the number (20) 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 21222033420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33991017984).

21222033420 is an abundant number, since it is smaller than the sum of its proper divisors (46760002548).

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

21222033420 is a wasteful number, since it uses less digits than its factorization.

21222033420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53239 (or 53237 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21222033420 its reverse (2433022212), we get a palindrome (23655055632).

The spelling of 21222033420 in words is "twenty-one billion, two hundred twenty-two million, thirty-three thousand, four hundred twenty".