210203421 has 4 divisors (see below), whose sum is σ = 280271232. Its totient is φ = 140135612.

The previous prime is 210203359. The next prime is 210203429. The reversal of 210203421 is 124302012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210203421 - 2⁷ = 210203293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210203421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210203429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35033901 + ... + 35033906.

It is an arithmetic number, because the mean of its divisors is an integer number (70067808).

Almost surely, 2^210203421 is an apocalyptic number.

It is an amenable number.

210203421 is a deficient number, since it is larger than the sum of its proper divisors (70067811).

210203421 is an equidigital number, since it uses as much as digits as its factorization.

210203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70067810.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 210203421 is about 14498.3937386181. The cubic root of 210203421 is about 594.5840569183.

Adding to 210203421 its reverse (124302012), we get a palindrome (334505433).

The spelling of 210203421 in words is "two hundred ten million, two hundred three thousand, four hundred twenty-one".