211242730 has 8 divisors (see below), whose sum is σ = 380236932. Its totient is φ = 84497088.

The previous prime is 211242673. The next prime is 211242749. The reversal of 211242730 is 37242112.

It can be written as a sum of positive squares in 2 ways, for example, as 197037369 + 14205361 = 14037^2 + 3769^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10562127 + ... + 10562146.

Almost surely, 2^211242730 is an apocalyptic number.

211242730 is a deficient number, since it is larger than the sum of its proper divisors (168994202).

211242730 is a wasteful number, since it uses less digits than its factorization.

211242730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21124280.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 211242730 is about 14534.1917559939. The cubic root of 211242730 is about 595.5623805069.

Adding to 211242730 its reverse (37242112), we get a palindrome (248484842).

The spelling of 211242730 in words is "two hundred eleven million, two hundred forty-two thousand, seven hundred thirty".