21222200121220 has 192 divisors, whose sum is σ = 54105522024960. Its totient is φ = 6838865510400.

The previous prime is 21222200121197. The next prime is 21222200121257. The reversal of 21222200121220 is 2212100222212.

It is a super-3 number, since 3×21222200121220³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 23581315 + ... + 24464725.

It is an arithmetic number, because the mean of its divisors is an integer number (281799593880).

Almost surely, 2^{21222200121220} is an apocalyptic number.

21222200121220 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 21222200121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27052761012480).

21222200121220 is an abundant number, since it is smaller than the sum of its proper divisors (32883321903740).

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

21222200121220 is a wasteful number, since it uses less digits than its factorization.

21222200121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883614 (or 883612 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222200121220 its reverse (2212100222212), we get a palindrome (23434300343432).

The spelling of 21222200121220 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred million, one hundred twenty-one thousand, two hundred twenty".