21725127322170 has 32 divisors (see below), whose sum is σ = 55207382372928. Its totient is φ = 5452580974848.

The previous prime is 21725127322147. The next prime is 21725127322183. The reversal of 21725127322170 is 7122372152712.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21299143924 + ... + 21299144943.

It is an arithmetic number, because the mean of its divisors is an integer number (1725230699154).

Almost surely, 2^{21725127322170} is an apocalyptic number.

21725127322170 is an abundant number, since it is smaller than the sum of its proper divisors (33482255050758).

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

21725127322170 is a wasteful number, since it uses less digits than its factorization.

21725127322170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42598288894.

The product of its (nonzero) digits is 164640, while the sum is 42.

Adding to 21725127322170 its reverse (7122372152712), we get a palindrome (28847499474882).

The spelling of 21725127322170 in words is "twenty-one trillion, seven hundred twenty-five billion, one hundred twenty-seven million, three hundred twenty-two thousand, one hundred seventy".