210001211100 has 54 divisors (see below), whose sum is σ = 658237132280. Its totient is φ = 56000322720.

The previous prime is 210001211039. The next prime is 210001211107. The reversal of 210001211100 is 1112100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001211107) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 116666440 + ... + 116668239.

Almost surely, 2^210001211100 is an apocalyptic number.

210001211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001211100 is an abundant number, since it is smaller than the sum of its proper divisors (448235921180).

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

210001211100 is a wasteful number, since it uses less digits than its factorization.

210001211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233334699 (or 233334689 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 210001211100 its reverse (1112100012), we get a palindrome (211113311112).

It can be divided in two parts, 2100012 and 11100, that added together give a palindrome (2111112).

The spelling of 210001211100 in words is "two hundred ten billion, one million, two hundred eleven thousand, one hundred".