212010221 has 8 divisors (see below), whose sum is σ = 217694400. Its totient is φ = 206350560.

The previous prime is 212010217. The next prime is 212010233. The reversal of 212010221 is 122010212.

It is a happy number.

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 212010221 - 2² = 212010217 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 (212010241) 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 7 ways as a sum of consecutive naturals, for example, 12110 + ... + 23888.

It is an arithmetic number, because the mean of its divisors is an integer number (27211800).

Almost surely, 2^212010221 is an apocalyptic number.

It is an amenable number.

212010221 is a deficient number, since it is larger than the sum of its proper divisors (5684179).

212010221 is a wasteful number, since it uses less digits than its factorization.

212010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259.

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

The square root of 212010221 is about 14560.5707649117. The cubic root of 212010221 is about 596.2827781806.

Adding to 212010221 its reverse (122010212), we get a palindrome (334020433).

Subtracting from 212010221 its reverse (122010212), we obtain a palindrome (90000009).

The spelling of 212010221 in words is "two hundred twelve million, ten thousand, two hundred twenty-one".