201211221100 has 72 divisors (see below), whose sum is σ = 439112954000. Its totient is φ = 80027723520.

The previous prime is 201211221097. The next prime is 201211221121. The reversal of 201211221100 is 1122112102.

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, 13815022 + ... + 13829578.

Almost surely, 2^201211221100 is an apocalyptic number.

201211221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211221100 is an abundant number, since it is smaller than the sum of its proper divisors (237901732900).

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

201211221100 is a wasteful number, since it uses less digits than its factorization.

201211221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15347 (or 15340 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201211221100 its reverse (1122112102), we get a palindrome (202333333202).

The spelling of 201211221100 in words is "two hundred one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred".