211742005 has 8 divisors (see below), whose sum is σ = 255036600. Its totient is φ = 168762816.

The previous prime is 211741993. The next prime is 211742033. The reversal of 211742005 is 500247112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14676561 + 197065444 = 3831^2 + 14038^2 .

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 211742005 - 2¹⁷ = 211610933 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 77370 + ... + 80059.

It is an arithmetic number, because the mean of its divisors is an integer number (31879575).

Almost surely, 2^211742005 is an apocalyptic number.

It is an amenable number.

211742005 is a deficient number, since it is larger than the sum of its proper divisors (43294595).

211742005 is a wasteful number, since it uses less digits than its factorization.

211742005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157703.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 211742005 is about 14551.3574968111. The cubic root of 211742005 is about 596.0312178669.

Adding to 211742005 its reverse (500247112), we get a palindrome (711989117).

The spelling of 211742005 in words is "two hundred eleven million, seven hundred forty-two thousand, five".