210141221 has 4 divisors (see below), whose sum is σ = 217387500. Its totient is φ = 202894944.

The previous prime is 210141119. The next prime is 210141223. The reversal of 210141221 is 122141012.

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 102292996 + 107848225 = 10114^2 + 10385^2 .

It is a cyclic number.

It is not a de Polignac number, because 210141221 - 2¹⁰ = 210140197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210141196 and 210141205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210141223) 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, 3623096 + ... + 3623153.

It is an arithmetic number, because the mean of its divisors is an integer number (54346875).

Almost surely, 2^210141221 is an apocalyptic number.

It is an amenable number.

210141221 is a deficient number, since it is larger than the sum of its proper divisors (7246279).

210141221 is an equidigital number, since it uses as much as digits as its factorization.

210141221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7246278.

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

The square root of 210141221 is about 14496.2485147020. The cubic root of 210141221 is about 594.5254045637.

Adding to 210141221 its reverse (122141012), we get a palindrome (332282233).

The spelling of 210141221 in words is "two hundred ten million, one hundred forty-one thousand, two hundred twenty-one".