21189670160 has 40 divisors (see below), whose sum is σ = 49272173016. Its totient is φ = 8474803200.

The previous prime is 21189670153. The next prime is 21189670163. The reversal of 21189670160 is 6107698112.

It can be written as a sum of positive squares in 4 ways, for example, as 1995230224 + 19194439936 = 44668^2 + 138544^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21189670163) 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, 1044110 + ... + 1064210.

Almost surely, 2^21189670160 is an apocalyptic number.

21189670160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21189670160 is an abundant number, since it is smaller than the sum of its proper divisors (28082502856).

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

21189670160 is a wasteful number, since it uses less digits than its factorization.

21189670160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33291 (or 33285 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 21189670160 in words is "twenty-one billion, one hundred eighty-nine million, six hundred seventy thousand, one hundred sixty".