212121234 has 32 divisors (see below), whose sum is σ = 507642240. Its totient is φ = 65267856.

The previous prime is 212121209. The next prime is 212121289. The reversal of 212121234 is 432121212.

It is a happy number.

212121234 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

212121234 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an alternating number because its digits alternate between even and odd.

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 15 ways as a sum of consecutive naturals, for example, 150382 + ... + 151785.

It is an arithmetic number, because the mean of its divisors is an integer number (15863820).

Almost surely, 2^212121234 is an apocalyptic number.

212121234 is an abundant number, since it is smaller than the sum of its proper divisors (295521006).

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

212121234 is a wasteful number, since it uses less digits than its factorization.

212121234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302191 (or 302185 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 212121234 is about 14564.3823761943. The cubic root of 212121234 is about 596.3868354118.

Adding to 212121234 its reverse (432121212), we get a palindrome (644242446).

The spelling of 212121234 in words is "two hundred twelve million, one hundred twenty-one thousand, two hundred thirty-four".