221220200000 has 84 divisors (see below), whose sum is σ = 548695170324. Its totient is φ = 88488000000.

The previous prime is 221220199957. The next prime is 221220200017. The reversal of 221220200000 is 2022122.

It can be written as a sum of positive squares in 6 ways, for example, as 209375795776 + 11844404224 = 457576^2 + 108832^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353051 + ... + 753050.

It is an arithmetic number, because the mean of its divisors is an integer number (6532085361).

Almost surely, 2^221220200000 is an apocalyptic number.

221220200000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220200000 is an abundant number, since it is smaller than the sum of its proper divisors (327474970324).

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

221220200000 is an frugal number, since it uses more digits than its factorization.

221220200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106138 (or 1106108 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 221220200000 its reverse (2022122), we get a palindrome (221222222122).

The spelling of 221220200000 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred thousand".