210421013 has 16 divisors (see below), whose sum is σ = 238161600. Its totient is φ = 184154880.

The previous prime is 210420989. The next prime is 210421027. The reversal of 210421013 is 310124012.

It is a cyclic number.

It is not a de Polignac number, because 210421013 - 2²⁰ = 209372437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210421073) 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, 140573 + ... + 142061.

It is an arithmetic number, because the mean of its divisors is an integer number (14885100).

Almost surely, 2^210421013 is an apocalyptic number.

It is an amenable number.

210421013 is a deficient number, since it is larger than the sum of its proper divisors (27740587).

210421013 is a wasteful number, since it uses less digits than its factorization.

210421013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 210421013 is about 14505.8958013630. The cubic root of 210421013 is about 594.7891473298.

Adding to 210421013 its reverse (310124012), we get a palindrome (520545025).

The spelling of 210421013 in words is "two hundred ten million, four hundred twenty-one thousand, thirteen".