201121212 has 24 divisors (see below), whose sum is σ = 470800512. Its totient is φ = 66823600.

The previous prime is 201121183. The next prime is 201121229. The reversal of 201121212 is 212121102.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23214 + ... + 30677.

It is an arithmetic number, because the mean of its divisors is an integer number (19616688).

Almost surely, 2^201121212 is an apocalyptic number.

It is an amenable number.

201121212 is an abundant number, since it is smaller than the sum of its proper divisors (269679300).

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

201121212 is a wasteful number, since it uses less digits than its factorization.

201121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54209 (or 54207 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 201121212 is about 14181.7210521149. The cubic root of 201121212 is about 585.8943264431.

Adding to 201121212 its reverse (212121102), we get a palindrome (413242314).

The spelling of 201121212 in words is "two hundred one million, one hundred twenty-one thousand, two hundred twelve".