21222312022002 has 128 divisors (see below), whose sum is σ = 52907955609600. Its totient is φ = 5525496228096.

The previous prime is 21222312021971. The next prime is 21222312022007. The reversal of 21222312022002 is 20022021322212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21222312022002.

It is not an unprimeable number, because it can be changed into a prime (21222312022007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 365186524 + ... + 365244632.

It is an arithmetic number, because the mean of its divisors is an integer number (413343403200).

Almost surely, 2^{21222312022002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222312022002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26453977804800).

21222312022002 is an abundant number, since it is smaller than the sum of its proper divisors (31685643587598).

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

21222312022002 is a wasteful number, since it uses less digits than its factorization.

21222312022002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66680.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21222312022002 its reverse (20022021322212), we get a palindrome (41244333344214).

The spelling of 21222312022002 in words is "twenty-one trillion, two hundred twenty-two billion, three hundred twelve million, twenty-two thousand, two".