213021221211 has 12 divisors (see below), whose sum is σ = 316013463792. Its totient is φ = 138175927056.

The previous prime is 213021221201. The next prime is 213021221251. The reversal of 213021221211 is 112122120312.

213021221211 is a `hidden beast` number, since 213 + 0 + 21 + 221 + 211 = 666.

213021221211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213021221211 - 2¹⁴ = 213021204827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213021221201) 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 11 ways as a sum of consecutive naturals, for example, 319851351 + ... + 319852016.

It is an arithmetic number, because the mean of its divisors is an integer number (26334455316).

Almost surely, 2^213021221211 is an apocalyptic number.

213021221211 is a deficient number, since it is larger than the sum of its proper divisors (102992242581).

213021221211 is a wasteful number, since it uses less digits than its factorization.

213021221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639703410 (or 639703407 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 213021221211 its reverse (112122120312), we get a palindrome (325143341523).

The spelling of 213021221211 in words is "two hundred thirteen billion, twenty-one million, two hundred twenty-one thousand, two hundred eleven".