21244203 has 24 divisors (see below), whose sum is σ = 33909408. Its totient is φ = 12748032.

The previous prime is 21244199. The next prime is 21244213. The reversal of 21244203 is 30244212.

It is not a de Polignac number, because 21244203 - 2² = 21244199 is a prime.

It is a super-2 number, since 2×21244203² = 902632322210418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21244213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 501 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (1412892).

Almost surely, 2^21244203 is an apocalyptic number.

21244203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21244203 is a deficient number, since it is larger than the sum of its proper divisors (12665205).

21244203 is a wasteful number, since it uses less digits than its factorization.

21244203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083 (or 6080 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21244203 is about 4609.1434128263. The cubic root of 21244203 is about 276.9577235675.

Adding to 21244203 its reverse (30244212), we get a palindrome (51488415).

Subtracting 21244203 from its reverse (30244212), we obtain a palindrome (9000009).

The spelling of 21244203 in words is "twenty-one million, two hundred forty-four thousand, two hundred three".