210042361 has 4 divisors (see below), whose sum is σ = 222397812. Its totient is φ = 197686912.

The previous prime is 210042347. The next prime is 210042409. The reversal of 210042361 is 163240012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55785961 + 154256400 = 7469^2 + 12420^2 .

It is a cyclic number.

It is not a de Polignac number, because 210042361 - 2¹³ = 210034169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210042341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6177700 + ... + 6177733.

It is an arithmetic number, because the mean of its divisors is an integer number (55599453).

Almost surely, 2^210042361 is an apocalyptic number.

It is an amenable number.

210042361 is a deficient number, since it is larger than the sum of its proper divisors (12355451).

210042361 is a wasteful number, since it uses less digits than its factorization.

210042361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12355450.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 210042361 is about 14492.8382658470. The cubic root of 210042361 is about 594.4321593318.

Adding to 210042361 its reverse (163240012), we get a palindrome (373282373).

The spelling of 210042361 in words is "two hundred ten million, forty-two thousand, three hundred sixty-one".