21169038688 has 96 divisors (see below), whose sum is σ = 48117694464. Its totient is φ = 8979973632.

The previous prime is 21169038661. The next prime is 21169038739. The reversal of 21169038688 is 88683096112.

It is a super-2 number, since 2×21169038688² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21534645 + ... + 21535627.

It is an arithmetic number, because the mean of its divisors is an integer number (501225984).

Almost surely, 2^21169038688 is an apocalyptic number.

21169038688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21169038688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24058847232).

21169038688 is an abundant number, since it is smaller than the sum of its proper divisors (26948655776).

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

21169038688 is a wasteful number, since it uses less digits than its factorization.

21169038688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884 (or 1876 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 21169038688 in words is "twenty-one billion, one hundred sixty-nine million, thirty-eight thousand, six hundred eighty-eight".