21422203 has 6 divisors (see below), whose sum is σ = 23546852. Its totient is φ = 19474620.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422203 is 30222412.

It is not a de Polignac number, because 21422203 - 2²¹ = 19325051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21422273) 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 5 ways as a sum of consecutive naturals, for example, 88401 + ... + 88642.

Almost surely, 2^21422203 is an apocalyptic number.

21422203 is a deficient number, since it is larger than the sum of its proper divisors (2124649).

21422203 is a wasteful number, since it uses less digits than its factorization.

21422203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177065 (or 177054 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21422203 is about 4628.4125788439. The cubic root of 21422203 is about 277.7290936132.

Adding to 21422203 its reverse (30222412), we get a palindrome (51644615).

It can be divided in two parts, 21 and 422203, that added together give a palindrome (422224).

The spelling of 21422203 in words is "twenty-one million, four hundred twenty-two thousand, two hundred three".