210042331 has 4 divisors (see below), whose sum is σ = 217285200. Its totient is φ = 202799464.

The previous prime is 210042281. The next prime is 210042341. The reversal of 210042331 is 133240012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 210042331 - 2¹⁵ = 210009563 is a prime.

It is a super-2 number, since 2×210042331² = 88235561623827122, which contains 22 as substring.

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, 3621391 + ... + 3621448.

It is an arithmetic number, because the mean of its divisors is an integer number (54321300).

Almost surely, 2^210042331 is an apocalyptic number.

210042331 is a deficient number, since it is larger than the sum of its proper divisors (7242869).

210042331 is an equidigital number, since it uses as much as digits as its factorization.

210042331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242868.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 210042331 is about 14492.8372308530. The cubic root of 210042331 is about 594.4321310312.

Adding to 210042331 its reverse (133240012), we get a palindrome (343282343).

The spelling of 210042331 in words is "two hundred ten million, forty-two thousand, three hundred thirty-one".