421000203203 has 4 divisors (see below), whose sum is σ = 439304559888. Its totient is φ = 402695846520.

The previous prime is 421000203181. The next prime is 421000203287. The reversal of 421000203203 is 302302000124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421000203203 - 2²⁴ = 420983425987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421000203293) 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, 9152178308 + ... + 9152178353.

It is an arithmetic number, because the mean of its divisors is an integer number (109826139972).

Almost surely, 2^421000203203 is an apocalyptic number.

421000203203 is a deficient number, since it is larger than the sum of its proper divisors (18304356685).

421000203203 is a wasteful number, since it uses less digits than its factorization.

421000203203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18304356684.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 421000203203 its reverse (302302000124), we get a palindrome (723302203327).

The spelling of 421000203203 in words is "four hundred twenty-one billion, two hundred three thousand, two hundred three".