21221203 has 8 divisors (see below), whose sum is σ = 22353408. Its totient is φ = 20106504.

The previous prime is 21221171. The next prime is 21221237. The reversal of 21221203 is 30212212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221203 - 2⁵ = 21221171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221273) 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, 1851 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (2794176).

Almost surely, 2^21221203 is an apocalyptic number.

21221203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21221203 is a deficient number, since it is larger than the sum of its proper divisors (1132205).

21221203 is a wasteful number, since it uses less digits than its factorization.

21221203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8753.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21221203 is about 4606.6476965360. The cubic root of 21221203 is about 276.8577382074.

Adding to 21221203 its reverse (30212212), we get a palindrome (51433415).

The spelling of 21221203 in words is "twenty-one million, two hundred twenty-one thousand, two hundred three".