2221002021200 has 120 divisors (see below), whose sum is σ = 5430874752216. Its totient is φ = 872637696000.

The previous prime is 2221002021181. The next prime is 2221002021211. The reversal of 2221002021200 is 21202001222.

It can be written as a sum of positive squares in 12 ways, for example, as 127331930896 + 2093670090304 = 356836^2 + 1446952^2 .

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, 17823110 + ... + 17947290.

Almost surely, 2^{2221002021200} is an apocalyptic number.

2221002021200 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 2221002021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2715437376108).

2221002021200 is an abundant number, since it is smaller than the sum of its proper divisors (3209872731016).

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

2221002021200 is a wasteful number, since it uses less digits than its factorization.

2221002021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124993 (or 124982 counting only the distinct ones).

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

Adding to 2221002021200 its reverse (21202001222), we get a palindrome (2242204022422).

The spelling of 2221002021200 in words is "two trillion, two hundred twenty-one billion, two million, twenty-one thousand, two hundred".