21222220000 has 120 divisors (see below), whose sum is σ = 53426191896. Its totient is φ = 8291136000.

The previous prime is 21222219983. The next prime is 21222220009. The reversal of 21222220000 is 2222212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222220009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 847662 + ... + 872338.

Almost surely, 2^21222220000 is an apocalyptic number.

21222220000 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 21222220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26713095948).

21222220000 is an abundant number, since it is smaller than the sum of its proper divisors (32203971896).

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

21222220000 is an equidigital number, since it uses as much as digits as its factorization.

21222220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24750 (or 24727 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21222220000 its reverse (2222212), we get a palindrome (21224442212).

The spelling of 21222220000 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty thousand".