201021212 has 24 divisors (see below), whose sum is σ = 403826304. Its totient is φ = 85769712.

The previous prime is 201021211. The next prime is 201021229. The reversal of 201021212 is 212120102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 201021193 and 201021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9458 + ... + 22169.

It is an arithmetic number, because the mean of its divisors is an integer number (16826096).

Almost surely, 2^201021212 is an apocalyptic number.

It is an amenable number.

201021212 is an abundant number, since it is smaller than the sum of its proper divisors (202805092).

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

201021212 is a wasteful number, since it uses less digits than its factorization.

201021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31865 (or 31863 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201021212 is about 14178.1949485821. The cubic root of 201021212 is about 585.7972056650.

Adding to 201021212 its reverse (212120102), we get a palindrome (413141314).

The spelling of 201021212 in words is "two hundred one million, twenty-one thousand, two hundred twelve".