21420014403 has 4 divisors (see below), whose sum is σ = 28560019208. Its totient is φ = 14280009600.

The previous prime is 21420014381. The next prime is 21420014461. The reversal of 21420014403 is 30441002412.

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

It is not a de Polignac number, because 21420014403 - 2⁶ = 21420014339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420014403.

It is not an unprimeable number, because it can be changed into a prime (21420014303) 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, 3570002398 + ... + 3570002403.

It is an arithmetic number, because the mean of its divisors is an integer number (7140004802).

Almost surely, 2^21420014403 is an apocalyptic number.

21420014403 is a deficient number, since it is larger than the sum of its proper divisors (7140004805).

21420014403 is an equidigital number, since it uses as much as digits as its factorization.

21420014403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140004804.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21420014403 its reverse (30441002412), we get a palindrome (51861016815).

The spelling of 21420014403 in words is "twenty-one billion, four hundred twenty million, fourteen thousand, four hundred three".