21301023222 has 128 divisors (see below), whose sum is σ = 51566699520. Its totient is φ = 6492510720.

The previous prime is 21301023209. The next prime is 21301023257. The reversal of 21301023222 is 22232010312.

It is a super-2 number, since 2×21301023222² (a number of 21 digits) contains 22 as substring.

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 = 21301023195 and 21301023204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4645543 + ... + 4650125.

It is an arithmetic number, because the mean of its divisors is an integer number (402864840).

Almost surely, 2^21301023222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21301023222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25783349760).

21301023222 is an abundant number, since it is smaller than the sum of its proper divisors (30265676298).

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

21301023222 is a wasteful number, since it uses less digits than its factorization.

21301023222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755 (or 4749 counting only the distinct ones).

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

Adding to 21301023222 its reverse (22232010312), we get a palindrome (43533033534).

The spelling of 21301023222 in words is "twenty-one billion, three hundred one million, twenty-three thousand, two hundred twenty-two".