211983921 has 12 divisors (see below), whose sum is σ = 316076800. Its totient is φ = 136763640.

The previous prime is 211983911. The next prime is 211983943. The reversal of 211983921 is 129389112.

It is not a de Polignac number, because 211983921 - 2⁶ = 211983857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211983911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 379621 + ... + 380178.

Almost surely, 2^211983921 is an apocalyptic number.

It is an amenable number.

211983921 is a deficient number, since it is larger than the sum of its proper divisors (104092879).

211983921 is a wasteful number, since it uses less digits than its factorization.

211983921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759836 (or 759833 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 211983921 is about 14559.6676129642. The cubic root of 211983921 is about 596.2581207443.

The spelling of 211983921 in words is "two hundred eleven million, nine hundred eighty-three thousand, nine hundred twenty-one".