21718161288 has 160 divisors (see below), whose sum is σ = 63295119360. Its totient is φ = 6949877760.

The previous prime is 21718161253. The next prime is 21718161301. The reversal of 21718161288 is 88216181712.

21718161288 is a `hidden beast` number, since 2 + 17 + 18 + 1 + 612 + 8 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2546920 + ... + 2555432.

It is an arithmetic number, because the mean of its divisors is an integer number (395594496).

Almost surely, 2^21718161288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21718161288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31647559680).

21718161288 is an abundant number, since it is smaller than the sum of its proper divisors (41576958072).

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

21718161288 is a wasteful number, since it uses less digits than its factorization.

21718161288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8689 (or 8676 counting only the distinct ones).

The product of its digits is 86016, while the sum is 45.

The spelling of 21718161288 in words is "twenty-one billion, seven hundred eighteen million, one hundred sixty-one thousand, two hundred eighty-eight".