21717887147 has 8 divisors (see below), whose sum is σ = 23760130800. Its totient is φ = 19686958560.

The previous prime is 21717887143. The next prime is 21717887161. The reversal of 21717887147 is 74178871712.

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

It is a cyclic number.

It is not a de Polignac number, because 21717887147 - 2² = 21717887143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21717887143) 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, 2824748 + ... + 2832425.

It is an arithmetic number, because the mean of its divisors is an integer number (2970016350).

Almost surely, 2^21717887147 is an apocalyptic number.

21717887147 is a deficient number, since it is larger than the sum of its proper divisors (2042243653).

21717887147 is a wasteful number, since it uses less digits than its factorization.

21717887147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657533.

The product of its digits is 1229312, while the sum is 53.

The spelling of 21717887147 in words is "twenty-one billion, seven hundred seventeen million, eight hundred eighty-seven thousand, one hundred forty-seven".