212002221 has 4 divisors (see below), whose sum is σ = 282669632. Its totient is φ = 141334812.

The previous prime is 212002199. The next prime is 212002229. The reversal of 212002221 is 122200212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212002221 - 2¹⁹ = 211477933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212002197 and 212002206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35333701 + ... + 35333706.

It is an arithmetic number, because the mean of its divisors is an integer number (70667408).

Almost surely, 2^212002221 is an apocalyptic number.

It is an amenable number.

212002221 is a deficient number, since it is larger than the sum of its proper divisors (70667411).

212002221 is an equidigital number, since it uses as much as digits as its factorization.

212002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70667410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 212002221 is about 14560.2960478144. The cubic root of 212002221 is about 596.2752780356.

Adding to 212002221 its reverse (122200212), we get a palindrome (334202433).

The spelling of 212002221 in words is "two hundred twelve million, two thousand, two hundred twenty-one".