21424341403 has 4 divisors (see below), whose sum is σ = 21645211000. Its totient is φ = 21203471808.

The previous prime is 21424341299. The next prime is 21424341427. The reversal of 21424341403 is 30414342412.

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 21424341403 - 2²⁵ = 21390786971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424341473) 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, 110434653 + ... + 110434846.

It is an arithmetic number, because the mean of its divisors is an integer number (5411302750).

Almost surely, 2^21424341403 is an apocalyptic number.

21424341403 is a deficient number, since it is larger than the sum of its proper divisors (220869597).

21424341403 is an equidigital number, since it uses as much as digits as its factorization.

21424341403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220869596.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21424341403 its reverse (30414342412), we get a palindrome (51838683815).

The spelling of 21424341403 in words is "twenty-one billion, four hundred twenty-four million, three hundred forty-one thousand, four hundred three".