210001212 has 36 divisors (see below), whose sum is σ = 533549016. Its totient is φ = 69642720.

The previous prime is 210001199. The next prime is 210001219. The reversal of 210001212 is 212100012.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 210001194 and 210001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7714 + ... + 21897.

It is an arithmetic number, because the mean of its divisors is an integer number (14820806).

Almost surely, 2^210001212 is an apocalyptic number.

It is an amenable number.

210001212 is an abundant number, since it is smaller than the sum of its proper divisors (323547804).

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

210001212 is a wasteful number, since it uses less digits than its factorization.

210001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29818 (or 29813 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 210001212 is about 14491.4185641020. The cubic root of 210001212 is about 594.3933387715.

Adding to 210001212 its reverse (212100012), we get a palindrome (422101224).

The spelling of 210001212 in words is "two hundred ten million, one thousand, two hundred twelve".