21223201223000 has 128 divisors (see below), whose sum is σ = 56834987489280. Its totient is φ = 7266515414400.

The previous prime is 21223201222889. The next prime is 21223201223039. The reversal of 21223201223000 is 32210232212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 31 ways as a sum of consecutive naturals, for example, 3003797 + ... + 7174203.

It is an arithmetic number, because the mean of its divisors is an integer number (444023339760).

Almost surely, 2^{21223201223000} is an apocalyptic number.

21223201223000 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 21223201223000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28417493744640).

21223201223000 is an abundant number, since it is smaller than the sum of its proper divisors (35611786266280).

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

21223201223000 is a wasteful number, since it uses less digits than its factorization.

21223201223000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171162 (or 4171148 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21223201223000 its reverse (32210232212), we get a palindrome (21255411455212).

The spelling of 21223201223000 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred one million, two hundred twenty-three thousand".