21222403403 has 4 divisors (see below), whose sum is σ = 21250439040. Its totient is φ = 21194367768.

The previous prime is 21222403369. The next prime is 21222403409. The reversal of 21222403403 is 30430422212.

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 21222403403 - 2¹⁰ = 21222402379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222403409) 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, 14016683 + ... + 14018196.

It is an arithmetic number, because the mean of its divisors is an integer number (5312609760).

Almost surely, 2^21222403403 is an apocalyptic number.

21222403403 is a deficient number, since it is larger than the sum of its proper divisors (28035637).

21222403403 is an equidigital number, since it uses as much as digits as its factorization.

21222403403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28035636.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21222403403 its reverse (30430422212), we get a palindrome (51652825615).

The spelling of 21222403403 in words is "twenty-one billion, two hundred twenty-two million, four hundred three thousand, four hundred three".