210211212221 has 8 divisors (see below), whose sum is σ = 211520025984. Its totient is φ = 208906457760.

The previous prime is 210211212199. The next prime is 210211212301. The reversal of 210211212221 is 122212112012.

210211212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210211212221 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 210211212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910901 + ... + 1118106.

It is an arithmetic number, because the mean of its divisors is an integer number (26440003248).

Almost surely, 2^210211212221 is an apocalyptic number.

It is an amenable number.

210211212221 is a deficient number, since it is larger than the sum of its proper divisors (1308813763).

210211212221 is a wasteful number, since it uses less digits than its factorization.

210211212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029651.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210211212221 its reverse (122212112012), we get a palindrome (332423324233).

The spelling of 210211212221 in words is "two hundred ten billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-one".