212104421 has 4 divisors (see below), whose sum is σ = 212353932. Its totient is φ = 211854912.

The previous prime is 212104397. The next prime is 212104447. The reversal of 212104421 is 124401212.

212104421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4456321 + 207648100 = 2111^2 + 14410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212104421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212104421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212109421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123476 + ... + 125181.

It is an arithmetic number, because the mean of its divisors is an integer number (53088483).

Almost surely, 2^212104421 is an apocalyptic number.

It is an amenable number.

212104421 is a deficient number, since it is larger than the sum of its proper divisors (249511).

212104421 is an equidigital number, since it uses as much as digits as its factorization.

212104421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249510.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 212104421 is about 14563.8051689797. The cubic root of 212104421 is about 596.3710782013.

Adding to 212104421 its reverse (124401212), we get a palindrome (336505633).

The spelling of 212104421 in words is "two hundred twelve million, one hundred four thousand, four hundred twenty-one".