21022424403 has 4 divisors (see below), whose sum is σ = 28029899208. Its totient is φ = 14014949600.

The previous prime is 21022424387. The next prime is 21022424459. The reversal of 21022424403 is 30442422012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21022424403 - 2⁴ = 21022424387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022424483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503737398 + ... + 3503737403.

It is an arithmetic number, because the mean of its divisors is an integer number (7007474802).

Almost surely, 2^21022424403 is an apocalyptic number.

21022424403 is a deficient number, since it is larger than the sum of its proper divisors (7007474805).

21022424403 is an equidigital number, since it uses as much as digits as its factorization.

21022424403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007474804.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21022424403 its reverse (30442422012), we get a palindrome (51464846415).

The spelling of 21022424403 in words is "twenty-one billion, twenty-two million, four hundred twenty-four thousand, four hundred three".