210120221 has 16 divisors (see below), whose sum is σ = 239189760. Its totient is φ = 183352320.

The previous prime is 210120217. The next prime is 210120233. The reversal of 210120221 is 122021012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210120221 - 2² = 210120217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120271) 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 15 ways as a sum of consecutive naturals, for example, 8261 + ... + 22101.

It is an arithmetic number, because the mean of its divisors is an integer number (14949360).

Almost surely, 2^210120221 is an apocalyptic number.

It is an amenable number.

210120221 is a deficient number, since it is larger than the sum of its proper divisors (29069539).

210120221 is a wasteful number, since it uses less digits than its factorization.

210120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13924.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210120221 is about 14495.5241712744. The cubic root of 210120221 is about 594.5055997085.

Adding to 210120221 its reverse (122021012), we get a palindrome (332141233).

It can be divided in two parts, 2101 and 20221, that added together give a palindrome (22322).

The spelling of 210120221 in words is "two hundred ten million, one hundred twenty thousand, two hundred twenty-one".