21711020170 has 32 divisors (see below), whose sum is σ = 45505369728. Its totient is φ = 7303328448.

The previous prime is 21711020167. The next prime is 21711020171. The reversal of 21711020170 is 7102011712.

It is not an unprimeable number, because it can be changed into a prime (21711020171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2922304 + ... + 2929723.

It is an arithmetic number, because the mean of its divisors is an integer number (1422042804).

Almost surely, 2^21711020170 is an apocalyptic number.

21711020170 is an abundant number, since it is smaller than the sum of its proper divisors (23794349558).

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

21711020170 is a wasteful number, since it uses less digits than its factorization.

21711020170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5852094.

The product of its (nonzero) digits is 196, while the sum is 22.

Adding to 21711020170 its reverse (7102011712), we get a palindrome (28813031882).

The spelling of 21711020170 in words is "twenty-one billion, seven hundred eleven million, twenty thousand, one hundred seventy".