210421312 has 14 divisors (see below), whose sum is σ = 417554918. Its totient is φ = 105210624.

The previous prime is 210421301. The next prime is 210421363. The reversal of 210421312 is 213124012.

It can be written as a sum of positive squares in only one way, i.e., 210134016 + 287296 = 14496^2 + 536^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1643853 + ... + 1643980.

Almost surely, 2^210421312 is an apocalyptic number.

It is an amenable number.

210421312 is a deficient number, since it is larger than the sum of its proper divisors (207133606).

210421312 is an equidigital number, since it uses as much as digits as its factorization.

210421312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287845 (or 3287835 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 210421312 is about 14505.9061075136. The cubic root of 210421312 is about 594.7894290537.

Adding to 210421312 its reverse (213124012), we get a palindrome (423545324).

The spelling of 210421312 in words is "two hundred ten million, four hundred twenty-one thousand, three hundred twelve".