221211021200 has 60 divisors (see below), whose sum is σ = 572340990228. Its totient is φ = 81677913600.

The previous prime is 221211021191. The next prime is 221211021203. The reversal of 221211021200 is 2120112122.

It can be written as a sum of positive squares in 6 ways, for example, as 38365840384 + 182845180816 = 195872^2 + 427604^2 .

It is not an unprimeable number, because it can be changed into a prime (221211021203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21265091 + ... + 21275490.

Almost surely, 2^221211021200 is an apocalyptic number.

221211021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211021200 is an abundant number, since it is smaller than the sum of its proper divisors (351129969028).

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

221211021200 is a wasteful number, since it uses less digits than its factorization.

221211021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42540612 (or 42540601 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221211021200 its reverse (2120112122), we get a palindrome (223331133322).

The spelling of 221211021200 in words is "two hundred twenty-one billion, two hundred eleven million, twenty-one thousand, two hundred".