21222010200120 has 128 divisors (see below), whose sum is σ = 63877147776000. Its totient is φ = 5640440417280.

The previous prime is 21222010200109. The next prime is 21222010200143. The reversal of 21222010200120 is 2100201022212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21222010200120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480995421 + ... + 481039539.

It is an arithmetic number, because the mean of its divisors is an integer number (499040217000).

Almost surely, 2^{21222010200120} is an apocalyptic number.

21222010200120 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 21222010200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31938573888000).

21222010200120 is an abundant number, since it is smaller than the sum of its proper divisors (42655137575880).

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

21222010200120 is a wasteful number, since it uses less digits than its factorization.

21222010200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57333 (or 57329 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222010200120 its reverse (2100201022212), we get a palindrome (23322211222332).

The spelling of 21222010200120 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, two hundred thousand, one hundred twenty".