21222003 has 16 divisors (see below), whose sum is σ = 31015296. Its totient is φ = 12800640.

The previous prime is 21221953. The next prime is 21222013. The reversal of 21222003 is 30022212.

It is not a de Polignac number, because 21222003 - 2¹² = 21217907 is a prime.

It is a super-2 number, since 2×21222003² = 900746822664018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21222003.

It is not an unprimeable number, because it can be changed into a prime (21222013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6075 + ... + 8907.

It is an arithmetic number, because the mean of its divisors is an integer number (1938456).

Almost surely, 2^21222003 is an apocalyptic number.

21222003 is a deficient number, since it is larger than the sum of its proper divisors (9793293).

21222003 is a wasteful number, since it uses less digits than its factorization.

21222003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21222003 is about 4606.7345267554. The cubic root of 21222003 is about 276.8612171715.

Adding to 21222003 its reverse (30022212), we get a palindrome (51244215).

The spelling of 21222003 in words is "twenty-one million, two hundred twenty-two thousand, three".