211742993 has 16 divisors (see below), whose sum is σ = 264518784. Its totient is φ = 164664960.

The previous prime is 211742987. The next prime is 211743001. The reversal of 211742993 is 399247112.

211742993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 211742993 - 2⁶ = 211742929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211742933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40421 + ... + 45357.

It is an arithmetic number, because the mean of its divisors is an integer number (16532424).

Almost surely, 2^211742993 is an apocalyptic number.

It is an amenable number.

211742993 is a deficient number, since it is larger than the sum of its proper divisors (52775791).

211742993 is a wasteful number, since it uses less digits than its factorization.

211742993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5512.

The product of its digits is 27216, while the sum is 38.

The square root of 211742993 is about 14551.3914454941. The cubic root of 211742993 is about 596.0321449038.

The spelling of 211742993 in words is "two hundred eleven million, seven hundred forty-two thousand, nine hundred ninety-three".