21231203 has 8 divisors (see below), whose sum is σ = 24310272. Its totient is φ = 18163656.

The previous prime is 21231173. The next prime is 21231241. The reversal of 21231203 is 30213212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21231203 - 2⁸ = 21230947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1526 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (3038784).

Almost surely, 2^21231203 is an apocalyptic number.

21231203 is a deficient number, since it is larger than the sum of its proper divisors (3079069).

21231203 is an equidigital number, since it uses as much as digits as its factorization.

21231203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21231203 is about 4607.7329566719. The cubic root of 21231203 is about 276.9012189755.

Adding to 21231203 its reverse (30213212), we get a palindrome (51444415).

Subtracting 21231203 from its reverse (30213212), we obtain a square (8982009 = 2997²).

The spelling of 21231203 in words is "twenty-one million, two hundred thirty-one thousand, two hundred three".