21331203 has 8 divisors (see below), whose sum is σ = 29210448. Its totient is φ = 13836384.

The previous prime is 21331201. The next prime is 21331217. The reversal of 21331203 is 30213312.

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

It is not a de Polignac number, because 21331203 - 2¹ = 21331201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331201) 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, 95976 + ... + 96197.

It is an arithmetic number, because the mean of its divisors is an integer number (3651306).

Almost surely, 2^21331203 is an apocalyptic number.

21331203 is a deficient number, since it is larger than the sum of its proper divisors (7879245).

21331203 is a wasteful number, since it uses less digits than its factorization.

21331203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192213.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21331203 is about 4618.5715324113. The cubic root of 21331203 is about 277.3352776165.

Adding to 21331203 its reverse (30213312), we get a palindrome (51544515).

The spelling of 21331203 in words is "twenty-one million, three hundred thirty-one thousand, two hundred three".