21168158814 has 160 divisors (see below), whose sum is σ = 52742866176. Its totient is φ = 6292010880.

The previous prime is 21168158801. The next prime is 21168158833. The reversal of 21168158814 is 41885186112.

21168158814 is a `hidden beast` number, since 2 + 1 + 1 + 68 + 1 + 588 + 1 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21168158814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 24699874 + ... + 24700730.

Almost surely, 2^21168158814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21168158814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26371433088).

21168158814 is an abundant number, since it is smaller than the sum of its proper divisors (31574707362).

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

21168158814 is a wasteful number, since it uses less digits than its factorization.

21168158814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132 (or 1123 counting only the distinct ones).

The product of its digits is 122880, while the sum is 45.

The spelling of 21168158814 in words is "twenty-one billion, one hundred sixty-eight million, one hundred fifty-eight thousand, eight hundred fourteen".