210642842 has 4 divisors (see below), whose sum is σ = 315964266. Its totient is φ = 105321420.

The previous prime is 210642791. The next prime is 210642847. The reversal of 210642842 is 248246012.

210642842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 127486681 + 83156161 = 11291^2 + 9119^2 .

It is not an unprimeable number, because it can be changed into a prime (210642847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52660709 + ... + 52660712.

Almost surely, 2^210642842 is an apocalyptic number.

210642842 is a deficient number, since it is larger than the sum of its proper divisors (105321424).

210642842 is a wasteful number, since it uses less digits than its factorization.

210642842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105321423.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 210642842 is about 14513.5399541256. The cubic root of 210642842 is about 594.9980858164.

Adding to 210642842 its reverse (248246012), we get a palindrome (458888854).

The spelling of 210642842 in words is "two hundred ten million, six hundred forty-two thousand, eight hundred forty-two".