210421143240 has 256 divisors, whose sum is σ = 787359744000. Its totient is φ = 43705543680.

The previous prime is 210421143223. The next prime is 210421143241. The reversal of 210421143240 is 42341124012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 210421143240.

It is not an unprimeable number, because it can be changed into a prime (210421143241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42861906 + ... + 42866814.

It is an arithmetic number, because the mean of its divisors is an integer number (3075624000).

Almost surely, 2^210421143240 is an apocalyptic number.

210421143240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210421143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393679872000).

210421143240 is an abundant number, since it is smaller than the sum of its proper divisors (576938600760).

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

210421143240 is a wasteful number, since it uses less digits than its factorization.

210421143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9580 (or 9576 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 210421143240 its reverse (42341124012), we get a palindrome (252762267252).

The spelling of 210421143240 in words is "two hundred ten billion, four hundred twenty-one million, one hundred forty-three thousand, two hundred forty".