21089172310572 has 12 divisors (see below), whose sum is σ = 49208068724696. Its totient is φ = 7029724103520.

The previous prime is 21089172310571. The next prime is 21089172310669. The reversal of 21089172310572 is 27501327198012.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21089172310571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878715512929 + ... + 878715512952.

Almost surely, 2^{21089172310572} is an apocalyptic number.

It is an amenable number.

21089172310572 is an abundant number, since it is smaller than the sum of its proper divisors (28118896414124).

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

21089172310572 is a wasteful number, since it uses less digits than its factorization.

21089172310572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757431025888 (or 1757431025886 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 21089172310572 in words is "twenty-one trillion, eighty-nine billion, one hundred seventy-two million, three hundred ten thousand, five hundred seventy-two".