211235134221 has 12 divisors (see below), whose sum is σ = 305122507872. Its totient is φ = 140821072776.

The previous prime is 211235134207. The next prime is 211235134237. The reversal of 211235134221 is 122431532112.

It is a happy number.

211235134221 is a `hidden beast` number, since 2 + 1 + 1 + 235 + 1 + 3 + 422 + 1 = 666.

It is not a de Polignac number, because 211235134221 - 2¹⁴ = 211235117837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211235134021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 505710 + ... + 823536.

It is an arithmetic number, because the mean of its divisors is an integer number (25426875656).

Almost surely, 2^211235134221 is an apocalyptic number.

It is an amenable number.

211235134221 is a deficient number, since it is larger than the sum of its proper divisors (93887373651).

211235134221 is a wasteful number, since it uses less digits than its factorization.

211235134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391680 (or 391677 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 211235134221 its reverse (122431532112), we get a palindrome (333666666333).

The spelling of 211235134221 in words is "two hundred eleven billion, two hundred thirty-five million, one hundred thirty-four thousand, two hundred twenty-one".