211123421 has 8 divisors (see below), whose sum is σ = 227404320. Its totient is φ = 195359472.

The previous prime is 211123411. The next prime is 211123427. The reversal of 211123421 is 124321112.

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

It is a cyclic number.

It is not a de Polignac number, because 211123421 - 2¹⁰ = 211122397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211123421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211123427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128390 + ... + 130023.

It is an arithmetic number, because the mean of its divisors is an integer number (28425540).

Almost surely, 2^211123421 is an apocalyptic number.

It is an amenable number.

211123421 is a deficient number, since it is larger than the sum of its proper divisors (16280899).

211123421 is a wasteful number, since it uses less digits than its factorization.

211123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258475.

The product of its digits is 96, while the sum is 17.

The square root of 211123421 is about 14530.0867512895. The cubic root of 211123421 is about 595.4502356872.

Adding to 211123421 its reverse (124321112), we get a palindrome (335444533).

The spelling of 211123421 in words is "two hundred eleven million, one hundred twenty-three thousand, four hundred twenty-one".