210444421 has 4 divisors (see below), whose sum is σ = 229575744. Its totient is φ = 191313100.

The previous prime is 210444413. The next prime is 210444439. The reversal of 210444421 is 124444012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 210444421 - 2³ = 210444413 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210444392 and 210444401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210444491) 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, 9565645 + ... + 9565666.

It is an arithmetic number, because the mean of its divisors is an integer number (57393936).

Almost surely, 2^210444421 is an apocalyptic number.

It is an amenable number.

210444421 is a deficient number, since it is larger than the sum of its proper divisors (19131323).

210444421 is a wasteful number, since it uses less digits than its factorization.

210444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19131322.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 210444421 is about 14506.7026232704. The cubic root of 210444421 is about 594.8112020158.

Adding to 210444421 its reverse (124444012), we get a palindrome (334888433).

The spelling of 210444421 in words is "two hundred ten million, four hundred forty-four thousand, four hundred twenty-one".