210421700 has 18 divisors (see below), whose sum is σ = 456615306. Its totient is φ = 84168640.

The previous prime is 210421691. The next prime is 210421703. The reversal of 210421700 is 7124012.

It can be written as a sum of positive squares in 3 ways, for example, as 1214404 + 209207296 = 1102^2 + 14464^2 .

It is not an unprimeable number, because it can be changed into a prime (210421703) 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 5 ways as a sum of consecutive naturals, for example, 1052009 + ... + 1052208.

It is an arithmetic number, because the mean of its divisors is an integer number (25367517).

Almost surely, 2^210421700 is an apocalyptic number.

210421700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210421700 is an abundant number, since it is smaller than the sum of its proper divisors (246193606).

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

210421700 is a wasteful number, since it uses less digits than its factorization.

210421700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104231 (or 2104224 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 210421700 is about 14505.9194813704. The cubic root of 210421700 is about 594.7897946348.

Adding to 210421700 its reverse (7124012), we get a palindrome (217545712).

The spelling of 210421700 in words is "two hundred ten million, four hundred twenty-one thousand, seven hundred".