21179181160 has 32 divisors (see below), whose sum is σ = 47829024000. Its totient is φ = 8440407360.

The previous prime is 21179181143. The next prime is 21179181187. The reversal of 21179181160 is 6118197112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 966060 + ... + 987739.

It is an arithmetic number, because the mean of its divisors is an integer number (1494657000).

Almost surely, 2^21179181160 is an apocalyptic number.

21179181160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21179181160 is an abundant number, since it is smaller than the sum of its proper divisors (26649842840).

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

21179181160 is a wasteful number, since it uses less digits than its factorization.

21179181160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954081 (or 1954077 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 37.

The spelling of 21179181160 in words is "twenty-one billion, one hundred seventy-nine million, one hundred eighty-one thousand, one hundred sixty".