212134221 has 80 divisors (see below), whose sum is σ = 375661440. Its totient is φ = 118039680.

The previous prime is 212134133. The next prime is 212134229. The reversal of 212134221 is 122431212.

It is a happy number.

212134221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212134221 - 2²² = 207939917 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212134194 and 212134203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212134229) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 459931 + ... + 460391.

It is an arithmetic number, because the mean of its divisors is an integer number (4695768).

Almost surely, 2^212134221 is an apocalyptic number.

It is an amenable number.

212134221 is a deficient number, since it is larger than the sum of its proper divisors (163527219).

212134221 is a wasteful number, since it uses less digits than its factorization.

212134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 519 counting only the distinct ones).

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

The square root of 212134221 is about 14564.8282173186. The cubic root of 212134221 is about 596.3990063099.

Adding to 212134221 its reverse (122431212), we get a palindrome (334565433).

The spelling of 212134221 in words is "two hundred twelve million, one hundred thirty-four thousand, two hundred twenty-one".