211223021211 has 24 divisors (see below), whose sum is σ = 313497466464. Its totient is φ = 136943239680.

The previous prime is 211223021203. The next prime is 211223021227. The reversal of 211223021211 is 112120322112.

211223021211 is a `hidden beast` number, since 211 + 2 + 230 + 212 + 11 = 666.

It is not a de Polignac number, because 211223021211 - 2³ = 211223021203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211223021281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 540570 + ... + 845376.

It is an arithmetic number, because the mean of its divisors is an integer number (13062394436).

Almost surely, 2^211223021211 is an apocalyptic number.

211223021211 is a deficient number, since it is larger than the sum of its proper divisors (102274445253).

211223021211 is a wasteful number, since it uses less digits than its factorization.

211223021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306931 (or 306928 counting only the distinct ones).

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

Adding to 211223021211 its reverse (112120322112), we get a palindrome (323343343323).

The spelling of 211223021211 in words is "two hundred eleven billion, two hundred twenty-three million, twenty-one thousand, two hundred eleven".