21422003 has 4 divisors (see below), whose sum is σ = 21431880. Its totient is φ = 21412128.

The previous prime is 21421997. The next prime is 21422021. The reversal of 21422003 is 30022412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21422003 - 2⁸ = 21421747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21422053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (5357970).

Almost surely, 2^21422003 is an apocalyptic number.

21422003 is a deficient number, since it is larger than the sum of its proper divisors (9877).

21422003 is an equidigital number, since it uses as much as digits as its factorization.

21422003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9876.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21422003 is about 4628.3909731137. The cubic root of 21422003 is about 277.7282293075.

Adding to 21422003 its reverse (30022412), we get a palindrome (51444415).

The spelling of 21422003 in words is "twenty-one million, four hundred twenty-two thousand, three".