21153499170 has 32 divisors (see below), whose sum is σ = 50852914560. Its totient is φ = 5631542400.

The previous prime is 21153499151. The next prime is 21153499187. The reversal of 21153499170 is 7199435112.

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, 568590 + ... + 604649.

It is an arithmetic number, because the mean of its divisors is an integer number (1589153580).

Almost surely, 2^21153499170 is an apocalyptic number.

21153499170 is an abundant number, since it is smaller than the sum of its proper divisors (29699415390).

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

21153499170 is a wasteful number, since it uses less digits than its factorization.

21153499170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173850.

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 21153499170 in words is "twenty-one billion, one hundred fifty-three million, four hundred ninety-nine thousand, one hundred seventy".