21200200170 has 64 divisors (see below), whose sum is σ = 51406811136. Its totient is φ = 5595125760.

The previous prime is 21200200169. The next prime is 21200200201. The reversal of 21200200170 is 7100200212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1597402 + ... + 1610618.

It is an arithmetic number, because the mean of its divisors is an integer number (803231424).

Almost surely, 2^21200200170 is an apocalyptic number.

21200200170 is an abundant number, since it is smaller than the sum of its proper divisors (30206610966).

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

21200200170 is a wasteful number, since it uses less digits than its factorization.

21200200170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13775.

The product of its (nonzero) digits is 56, while the sum is 15.

Adding to 21200200170 its reverse (7100200212), we get a palindrome (28300400382).

The spelling of 21200200170 in words is "twenty-one billion, two hundred million, two hundred thousand, one hundred seventy".