210101221 has 8 divisors (see below), whose sum is σ = 241264800. Its totient is φ = 180948240.

The previous prime is 210101189. The next prime is 210101273. The reversal of 210101221 is 122101012.

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

It is not a de Polignac number, because 210101221 - 2⁵ = 210101189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210101198 and 210101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101921) 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, 502426 + ... + 502843.

It is an arithmetic number, because the mean of its divisors is an integer number (30158100).

Almost surely, 2^210101221 is an apocalyptic number.

It is an amenable number.

210101221 is a deficient number, since it is larger than the sum of its proper divisors (31163579).

210101221 is a wasteful number, since it uses less digits than its factorization.

210101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005299.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 210101221 is about 14494.8687817448. The cubic root of 210101221 is about 594.4876798928.

Adding to 210101221 its reverse (122101012), we get a palindrome (332202233).

The spelling of 210101221 in words is "two hundred ten million, one hundred one thousand, two hundred twenty-one".