21231222210000 has 600 divisors, whose sum is σ = 81098242505280. Its totient is φ = 5140627200000.

The previous prime is 21231222209999. The next prime is 21231222210007. The reversal of 21231222210000 is 1222213212.

21231222210000 is a `hidden beast` number, since 2 + 1 + 231 + 222 + 210 + 0 + 0 + 0 = 666.

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 (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231222210007) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 830597220 + ... + 830622780.

Almost surely, 2^{21231222210000} is an apocalyptic number.

21231222210000 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 21231222210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40549121252640).

21231222210000 is an abundant number, since it is smaller than the sum of its proper divisors (59867020295280).

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

21231222210000 is a wasteful number, since it uses less digits than its factorization.

21231222210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26445 (or 26421 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21231222210000 its reverse (1222213212), we get a palindrome (21232444423212).

The spelling of 21231222210000 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred twenty-two million, two hundred ten thousand".