201211211100 has 36 divisors (see below), whose sum is σ = 582171104984. Its totient is φ = 53656322880.

The previous prime is 201211211083. The next prime is 201211211111. The reversal of 201211211100 is 1112112102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335351719 + ... + 335352318.

Almost surely, 2^201211211100 is an apocalyptic number.

201211211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211211100 is an abundant number, since it is smaller than the sum of its proper divisors (380959893884).

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

201211211100 is a wasteful number, since it uses less digits than its factorization.

201211211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670704054 (or 670704047 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 201211211100 its reverse (1112112102), we get a palindrome (202323323202).

The spelling of 201211211100 in words is "two hundred one billion, two hundred eleven million, two hundred eleven thousand, one hundred".