221201021200 has 30 divisors (see below), whose sum is σ = 531435454394. Its totient is φ = 88480408320.

The previous prime is 221201021191. The next prime is 221201021207. The reversal of 221201021200 is 2120102122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 28950341904 + 192250679296 = 170148^2 + 438464^2 .

It is not an unprimeable number, because it can be changed into a prime (221201021207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276500877 + ... + 276501676.

Almost surely, 2^221201021200 is an apocalyptic number.

221201021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201021200 is an abundant number, since it is smaller than the sum of its proper divisors (310234433194).

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

221201021200 is a wasteful number, since it uses less digits than its factorization.

221201021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553002571 (or 553002560 counting only the distinct ones).

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

Adding to 221201021200 its reverse (2120102122), we get a palindrome (223321123322).

The spelling of 221201021200 in words is "two hundred twenty-one billion, two hundred one million, twenty-one thousand, two hundred".