21102110170 has 16 divisors (see below), whose sum is σ = 38040249960. Its totient is φ = 8428299264.

The previous prime is 21102110123. The next prime is 21102110171. The reversal of 21102110170 is 7101120112.

It can be written as a sum of positive squares in 4 ways, for example, as 14467518961 + 6634591209 = 120281^2 + 81453^2 .

It is not an unprimeable number, because it can be changed into a prime (21102110171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1561035 + ... + 1574494.

Almost surely, 2^21102110170 is an apocalyptic number.

21102110170 is a deficient number, since it is larger than the sum of its proper divisors (16938139790).

21102110170 is a wasteful number, since it uses less digits than its factorization.

21102110170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136209.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 21102110170 its reverse (7101120112), we get a palindrome (28203230282).

The spelling of 21102110170 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, one hundred seventy".