210112421 has 4 divisors (see below), whose sum is σ = 212192844. Its totient is φ = 208032000.

The previous prime is 210112391. The next prime is 210112439. The reversal of 210112421 is 124211012.

It is a happy number.

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 202350625 + 7761796 = 14225^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 210112421 - 2²² = 205918117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210112396 and 210112405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210112471) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1040060 + ... + 1040261.

It is an arithmetic number, because the mean of its divisors is an integer number (53048211).

Almost surely, 2^210112421 is an apocalyptic number.

It is an amenable number.

210112421 is a deficient number, since it is larger than the sum of its proper divisors (2080423).

210112421 is a wasteful number, since it uses less digits than its factorization.

210112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080422.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 210112421 is about 14495.2551202109. The cubic root of 210112421 is about 594.4982432833.

Adding to 210112421 its reverse (124211012), we get a palindrome (334323433).

It can be divided in two parts, 21011 and 2421, that added together give a palindrome (23432).

The spelling of 210112421 in words is "two hundred ten million, one hundred twelve thousand, four hundred twenty-one".