210021212 has 24 divisors (see below), whose sum is σ = 388357200. Its totient is φ = 99104256.

The previous prime is 210021209. The next prime is 210021241. The reversal of 210021212 is 212120012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210021193 and 210021202.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15308 + ... + 25580.

It is an arithmetic number, because the mean of its divisors is an integer number (16181550).

Almost surely, 2^210021212 is an apocalyptic number.

It is an amenable number.

210021212 is a deficient number, since it is larger than the sum of its proper divisors (178335988).

210021212 is a wasteful number, since it uses less digits than its factorization.

210021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565 (or 10563 counting only the distinct ones).

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

The square root of 210021212 is about 14492.1086112408. The cubic root of 210021212 is about 594.4122076934.

Adding to 210021212 its reverse (212120012), we get a palindrome (422141224).

The spelling of 210021212 in words is "two hundred ten million, twenty-one thousand, two hundred twelve".