21488171903 has 4 divisors (see below), whose sum is σ = 23441642088. Its totient is φ = 19534701720.

The previous prime is 21488171897. The next prime is 21488171917. The reversal of 21488171903 is 30917188412.

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 21488171903 - 2⁶ = 21488171839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488170903) 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, 976735076 + ... + 976735097.

It is an arithmetic number, because the mean of its divisors is an integer number (5860410522).

Almost surely, 2^21488171903 is an apocalyptic number.

21488171903 is a deficient number, since it is larger than the sum of its proper divisors (1953470185).

21488171903 is a wasteful number, since it uses less digits than its factorization.

21488171903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953470184.

The product of its (nonzero) digits is 96768, while the sum is 44.

It can be divided in two parts, 21488 and 171903, that added together give a palindrome (193391).

The spelling of 21488171903 in words is "twenty-one billion, four hundred eighty-eight million, one hundred seventy-one thousand, nine hundred three".