21221001002200 has 96 divisors (see below), whose sum is σ = 52289989387200. Its totient is φ = 7981607946240.

The previous prime is 21221001002171. The next prime is 21221001002429. The reversal of 21221001002200 is 220010012212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 715297 + ... + 6553903.

It is an arithmetic number, because the mean of its divisors is an integer number (544687389450).

Almost surely, 2^{21221001002200} is an apocalyptic number.

21221001002200 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 21221001002200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26144994693600).

21221001002200 is an abundant number, since it is smaller than the sum of its proper divisors (31068988385000).

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

21221001002200 is a wasteful number, since it uses less digits than its factorization.

21221001002200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839709 (or 5839700 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21221001002200 its reverse (220010012212), we get a palindrome (21441011014412).

The spelling of 21221001002200 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two thousand, two hundred".