21001412423603 has 4 divisors (see below), whose sum is σ = 21106947159600. Its totient is φ = 20895877687608.

The previous prime is 21001412423599. The next prime is 21001412423711. The reversal of 21001412423603 is 30632421410012.

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 21001412423603 - 2² = 21001412423599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001412423003) 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, 52767367700 + ... + 52767368097.

It is an arithmetic number, because the mean of its divisors is an integer number (5276736789900).

Almost surely, 2^{21001412423603} is an apocalyptic number.

21001412423603 is a deficient number, since it is larger than the sum of its proper divisors (105534735997).

21001412423603 is a wasteful number, since it uses less digits than its factorization.

21001412423603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105534735996.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21001412423603 its reverse (30632421410012), we get a palindrome (51633833833615).

The spelling of 21001412423603 in words is "twenty-one trillion, one billion, four hundred twelve million, four hundred twenty-three thousand, six hundred three".