21401401403 has 4 divisors (see below), whose sum is σ = 21764137080. Its totient is φ = 21038665728.

The previous prime is 21401401369. The next prime is 21401401481. The reversal of 21401401403 is 30410410412.

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 21401401403 - 2⁶ = 21401401339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401401493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181367750 + ... + 181367867.

It is an arithmetic number, because the mean of its divisors is an integer number (5441034270).

Almost surely, 2^21401401403 is an apocalyptic number.

21401401403 is a deficient number, since it is larger than the sum of its proper divisors (362735677).

21401401403 is an equidigital number, since it uses as much as digits as its factorization.

21401401403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362735676.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21401401403 its reverse (30410410412), we get a palindrome (51811811815).

Subtracting 21401401403 from its reverse (30410410412), we obtain a palindrome (9009009009).

The spelling of 21401401403 in words is "twenty-one billion, four hundred one million, four hundred one thousand, four hundred three".