211330421 has 8 divisors (see below), whose sum is σ = 217237944. Its totient is φ = 205433280.

The previous prime is 211330403. The next prime is 211330429. The reversal of 211330421 is 124033112.

211330421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 75864100 + 135466321 = 8710^2 + 11639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211330421 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 211330421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211330429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57911 + ... + 61451.

It is an arithmetic number, because the mean of its divisors is an integer number (27154743).

Almost surely, 2^211330421 is an apocalyptic number.

It is an amenable number.

211330421 is a deficient number, since it is larger than the sum of its proper divisors (5907523).

211330421 is a wasteful number, since it uses less digits than its factorization.

211330421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 211330421 is about 14537.2081570018. The cubic root of 211330421 is about 595.6447789809.

Adding to 211330421 its reverse (124033112), we get a palindrome (335363533).

The spelling of 211330421 in words is "two hundred eleven million, three hundred thirty thousand, four hundred twenty-one".