211210212211021 has 4 divisors (see below), whose sum is σ = 220393264915872. Its totient is φ = 202027159506172.

The previous prime is 211210212210971. The next prime is 211210212211057. The reversal of 211210212211021 is 120112212012112.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 211210212211021 - 2⁹ = 211210212210509 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 211210212211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210212211421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4591526352391 + ... + 4591526352436.

It is an arithmetic number, because the mean of its divisors is an integer number (55098316228968).

Almost surely, 2^{211210212211021} is an apocalyptic number.

It is an amenable number.

211210212211021 is a deficient number, since it is larger than the sum of its proper divisors (9183052704851).

211210212211021 is an equidigital number, since it uses as much as digits as its factorization.

211210212211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9183052704850.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211210212211021 its reverse (120112212012112), we get a palindrome (331322424223133).

The spelling of 211210212211021 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twelve million, two hundred eleven thousand, twenty-one".