210240420 has 48 divisors (see below), whose sum is σ = 633958080. Its totient is φ = 51751296.

The previous prime is 210240397. The next prime is 210240421. The reversal of 210240420 is 24042012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 210240420.

It is not an unprimeable number, because it can be changed into a prime (210240421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133990 + ... + 135549.

It is an arithmetic number, because the mean of its divisors is an integer number (13207460).

Almost surely, 2^210240420 is an apocalyptic number.

210240420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210240420 is an abundant number, since it is smaller than the sum of its proper divisors (423717660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210240420 is a wasteful number, since it uses less digits than its factorization.

210240420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269564 (or 269562 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 210240420 is about 14499.6696514093. The cubic root of 210240420 is about 594.6189401516.

Adding to 210240420 its reverse (24042012), we get a palindrome (234282432).

The spelling of 210240420 in words is "two hundred ten million, two hundred forty thousand, four hundred twenty".