221551220200 has 24 divisors (see below), whose sum is σ = 515106587430. Its totient is φ = 88620488000.

The previous prime is 221551220197. The next prime is 221551220249. The reversal of 221551220200 is 2022155122.

It can be written as a sum of positive squares in 3 ways, for example, as 212297934564 + 9253285636 = 460758^2 + 96194^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 553877851 + ... + 553878250.

Almost surely, 2^221551220200 is an apocalyptic number.

221551220200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221551220200 is an abundant number, since it is smaller than the sum of its proper divisors (293555367230).

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

221551220200 is a wasteful number, since it uses less digits than its factorization.

221551220200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107756117 (or 1107756108 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 221551220200 its reverse (2022155122), we get a palindrome (223573375322).

The spelling of 221551220200 in words is "two hundred twenty-one billion, five hundred fifty-one million, two hundred twenty thousand, two hundred".