21221202200000 has 336 divisors, whose sum is σ = 58207192813728. Its totient is φ = 7611033600000.

The previous prime is 21221202199957. The next prime is 21221202200021. The reversal of 21221202200000 is 220212212.

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, 160533932 + ... + 160666068.

It is an arithmetic number, because the mean of its divisors is an integer number (173235692898).

Almost surely, 2^{21221202200000} is an apocalyptic number.

21221202200000 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 21221202200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29103596406864).

21221202200000 is an abundant number, since it is smaller than the sum of its proper divisors (36985990613728).

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

21221202200000 is an equidigital number, since it uses as much as digits as its factorization.

21221202200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132258 (or 132228 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21221202200000 its reverse (220212212), we get a palindrome (21221422412212).

The spelling of 21221202200000 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, two hundred thousand".