21455838603 has 16 divisors (see below), whose sum is σ = 31788766240. Its totient is φ = 14302840032.

The previous prime is 21455838487. The next prime is 21455838623. The reversal of 21455838603 is 30683855412.

21455838603 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 5 + 8 + 38 + 603 = 666.

It is not a de Polignac number, because 21455838603 - 2⁸ = 21455838347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455838623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561825 + ... + 598797.

It is an arithmetic number, because the mean of its divisors is an integer number (1986797890).

Almost surely, 2^21455838603 is an apocalyptic number.

21455838603 is a deficient number, since it is larger than the sum of its proper divisors (10332927637).

21455838603 is a wasteful number, since it uses less digits than its factorization.

21455838603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58475 (or 58469 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 21455838603 in words is "twenty-one billion, four hundred fifty-five million, eight hundred thirty-eight thousand, six hundred three".