211133421 has 12 divisors (see below), whose sum is σ = 322910172. Its totient is φ = 132475776.

The previous prime is 211133407. The next prime is 211133431. The reversal of 211133421 is 124331112.

211133421 is a `hidden beast` number, since 211 + 1 + 33 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 195021225 + 16112196 = 13965^2 + 4014^2 .

It is not a de Polignac number, because 211133421 - 2¹¹ = 211131373 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211133394 and 211133403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211133431) 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, 689826 + ... + 690131.

It is an arithmetic number, because the mean of its divisors is an integer number (26909181).

Almost surely, 2^211133421 is an apocalyptic number.

It is an amenable number.

211133421 is a deficient number, since it is larger than the sum of its proper divisors (111776751).

211133421 is a wasteful number, since it uses less digits than its factorization.

211133421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379980 (or 1379977 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 211133421 is about 14530.4308607832. The cubic root of 211133421 is about 595.4596368364.

Adding to 211133421 its reverse (124331112), we get a palindrome (335464533).

The spelling of 211133421 in words is "two hundred eleven million, one hundred thirty-three thousand, four hundred twenty-one".