210072221 has 8 divisors (see below), whose sum is σ = 212579640. Its totient is φ = 207571968.

The previous prime is 210072217. The next prime is 210072241. The reversal of 210072221 is 122270012.

210072221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13764100 + 196308121 = 3710^2 + 14011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210072221 - 2² = 210072217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210072221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210072241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77135 + ... + 79811.

It is an arithmetic number, because the mean of its divisors is an integer number (26572455).

Almost surely, 2^210072221 is an apocalyptic number.

It is an amenable number.

210072221 is a deficient number, since it is larger than the sum of its proper divisors (2507419).

210072221 is an equidigital number, since it uses as much as digits as its factorization.

210072221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 210072221 is about 14493.8683932206. The cubic root of 210072221 is about 594.4603265122.

The spelling of 210072221 in words is "two hundred ten million, seventy-two thousand, two hundred twenty-one".