21220231200000 has 432 divisors, whose sum is σ = 80675987656320. Its totient is φ = 4850334720000.

The previous prime is 21220231199933. The next prime is 21220231200011. The reversal of 21220231200000 is 213202212.

It is a happy number.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16168446 + ... + 17431554.

Almost surely, 2^{21220231200000} is an apocalyptic number.

21220231200000 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 21220231200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40337993828160).

21220231200000 is an abundant number, since it is smaller than the sum of its proper divisors (59455756456320).

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

21220231200000 is an frugal number, since it uses more digits than its factorization.

21220231200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263160 (or 1263126 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21220231200000 its reverse (213202212), we get a palindrome (21220444402212).

The spelling of 21220231200000 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirty-one million, two hundred thousand".