210040442 has 4 divisors (see below), whose sum is σ = 315060666. Its totient is φ = 105020220.

The previous prime is 210040429. The next prime is 210040463. The reversal of 210040442 is 244040012.

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., 127938721 + 82101721 = 11311^2 + 9061^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 210040442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52510109 + ... + 52510112.

Almost surely, 2^210040442 is an apocalyptic number.

210040442 is a deficient number, since it is larger than the sum of its proper divisors (105020224).

210040442 is a wasteful number, since it uses less digits than its factorization.

210040442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105020223.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 210040442 is about 14492.7720605825. The cubic root of 210040442 is about 594.4303490322.

Adding to 210040442 its reverse (244040012), we get a palindrome (454080454).

The spelling of 210040442 in words is "two hundred ten million, forty thousand, four hundred forty-two".