211305442 has 4 divisors (see below), whose sum is σ = 316958166. Its totient is φ = 105652720.

The previous prime is 211305421. The next prime is 211305449. The reversal of 211305442 is 244503112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 158030041 + 53275401 = 12571^2 + 7299^2 .

It is not an unprimeable number, because it can be changed into a prime (211305449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52826359 + ... + 52826362.

Almost surely, 2^211305442 is an apocalyptic number.

211305442 is a deficient number, since it is larger than the sum of its proper divisors (105652724).

211305442 is a wasteful number, since it uses less digits than its factorization.

211305442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105652723.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 211305442 is about 14536.3489914077. The cubic root of 211305442 is about 595.6213098922.

Adding to 211305442 its reverse (244503112), we get a palindrome (455808554).

The spelling of 211305442 in words is "two hundred eleven million, three hundred five thousand, four hundred forty-two".