21371203 has 6 divisors (see below), whose sum is σ = 24860436. Its totient is φ = 18318132.

The previous prime is 21371201. The next prime is 21371239. The reversal of 21371203 is 30217312.

It is not a de Polignac number, because 21371203 - 2¹ = 21371201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21371201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218025 + ... + 218122.

It is an arithmetic number, because the mean of its divisors is an integer number (4143406).

Almost surely, 2^21371203 is an apocalyptic number.

21371203 is a deficient number, since it is larger than the sum of its proper divisors (3489233).

21371203 is an equidigital number, since it uses as much as digits as its factorization.

21371203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436161 (or 436154 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21371203 is about 4622.8998474983. The cubic root of 21371203 is about 277.5085212328.

Adding to 21371203 its reverse (30217312), we get a palindrome (51588515).

The spelling of 21371203 in words is "twenty-one million, three hundred seventy-one thousand, two hundred three".