21717886452 has 24 divisors (see below), whose sum is σ = 50682490656. Its totient is φ = 7238235168.

The previous prime is 21717886441. The next prime is 21717886469. The reversal of 21717886452 is 25468871712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21717886395 and 21717886404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44878 + ... + 213189.

It is an arithmetic number, because the mean of its divisors is an integer number (2111770444).

Almost surely, 2^21717886452 is an apocalyptic number.

It is an amenable number.

21717886452 is an abundant number, since it is smaller than the sum of its proper divisors (28964604204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21717886452 is a wasteful number, since it uses less digits than its factorization.

21717886452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265087 (or 265085 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 51.

The spelling of 21717886452 in words is "twenty-one billion, seven hundred seventeen million, eight hundred eighty-six thousand, four hundred fifty-two".