21473786887 has 8 divisors (see below), whose sum is σ = 24636964896. Its totient is φ = 18334482432.

The previous prime is 21473786881. The next prime is 21473786891. The reversal of 21473786887 is 78868737412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21473786887 - 2²⁷ = 21339569159 is a prime.

It is a super-2 number, since 2×21473786887² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473786881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5966458 + ... + 5970055.

It is an arithmetic number, because the mean of its divisors is an integer number (3079620612).

Almost surely, 2^21473786887 is an apocalyptic number.

21473786887 is a deficient number, since it is larger than the sum of its proper divisors (3163178009).

21473786887 is a wasteful number, since it uses less digits than its factorization.

21473786887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11936777.

The product of its digits is 25288704, while the sum is 61.

The spelling of 21473786887 in words is "twenty-one billion, four hundred seventy-three million, seven hundred eighty-six thousand, eight hundred eighty-seven".