210205442 has 32 divisors (see below), whose sum is σ = 345615984. Its totient is φ = 95488000.

The previous prime is 210205423. The next prime is 210205453. The reversal of 210205442 is 244502012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 175854121 + 34351321 = 13261^2 + 5861^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140048 + ... + 141540.

Almost surely, 2^210205442 is an apocalyptic number.

210205442 is a deficient number, since it is larger than the sum of its proper divisors (135410542).

210205442 is a wasteful number, since it uses less digits than its factorization.

210205442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 210205442 is about 14498.4634358266. The cubic root of 210205442 is about 594.5859624543.

Adding to 210205442 its reverse (244502012), we get a palindrome (454707454).

It can be divided in two parts, 21020 and 5442, that added together give a palindrome (26462).

The spelling of 210205442 in words is "two hundred ten million, two hundred five thousand, four hundred forty-two".