210540242 has 32 divisors (see below), whose sum is σ = 350481600. Its totient is φ = 94844640.

The previous prime is 210540241. The next prime is 210540259. The reversal of 210540242 is 242045012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (210540241) by changing a digit.

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, 369734 + ... + 370302.

It is an arithmetic number, because the mean of its divisors is an integer number (10952550).

Almost surely, 2^210540242 is an apocalyptic number.

210540242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

210540242 is a deficient number, since it is larger than the sum of its proper divisors (139941358).

210540242 is a wasteful number, since it uses less digits than its factorization.

210540242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 721 counting only the distinct ones).

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

The square root of 210540242 is about 14510.0048931763. The cubic root of 210540242 is about 594.9014661587.

Adding to 210540242 its reverse (242045012), we get a palindrome (452585254).

The spelling of 210540242 in words is "two hundred ten million, five hundred forty thousand, two hundred forty-two".