210221712 has 30 divisors (see below), whose sum is σ = 588329222. Its totient is φ = 70073856.

The previous prime is 210221707. The next prime is 210221729. The reversal of 210221712 is 217122012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 183223296 + 26998416 = 13536^2 + 5196^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 729793 + ... + 730080.

Almost surely, 2^210221712 is an apocalyptic number.

It is an amenable number.

210221712 is an abundant number, since it is smaller than the sum of its proper divisors (378107510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210221712 is a wasteful number, since it uses less digits than its factorization.

210221712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459887 (or 1459878 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 210221712 is about 14499.0245189116. The cubic root of 210221712 is about 594.6013024695.

Adding to 210221712 its reverse (217122012), we get a palindrome (427343724).

The spelling of 210221712 in words is "two hundred ten million, two hundred twenty-one thousand, seven hundred twelve".