211489993 has 16 divisors (see below), whose sum is σ = 249867072. Its totient is φ = 176472000.

The previous prime is 211489987. The next prime is 211490023. The reversal of 211489993 is 399984112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211489993 - 2⁵ = 211489961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211489963) 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 15 ways as a sum of consecutive naturals, for example, 21798 + ... + 29968.

It is an arithmetic number, because the mean of its divisors is an integer number (15616692).

Almost surely, 2^211489993 is an apocalyptic number.

It is an amenable number.

211489993 is a deficient number, since it is larger than the sum of its proper divisors (38377079).

211489993 is a wasteful number, since it uses less digits than its factorization.

211489993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8376.

The product of its digits is 139968, while the sum is 46.

The square root of 211489993 is about 14542.6955204322. The cubic root of 211489993 is about 595.7946616704.

The spelling of 211489993 in words is "two hundred eleven million, four hundred eighty-nine thousand, nine hundred ninety-three".