21222012210000 has 600 divisors, whose sum is σ = 79930722231360. Its totient is φ = 4836238848000.

The previous prime is 21222012209999. The next prime is 21222012210029. The reversal of 21222012210000 is 1221022212.

It is a tau number, because it is divible by the number of its divisors (600).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 495368581 + ... + 495411419.

Almost surely, 2^{21222012210000} is an apocalyptic number.

21222012210000 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 21222012210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39965361115680).

21222012210000 is an abundant number, since it is smaller than the sum of its proper divisors (58708710021360).

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

21222012210000 is a wasteful number, since it uses less digits than its factorization.

21222012210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43221 (or 43193 counting only the distinct ones).

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

Adding to 21222012210000 its reverse (1221022212), we get a palindrome (21223233232212).

The spelling of 21222012210000 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, two hundred ten thousand".