21100102010 has 16 divisors (see below), whose sum is σ = 40901736456. Its totient is φ = 7790806848.

The previous prime is 21100101949. The next prime is 21100102019. The reversal of 21100102010 is 1020100112.

It can be written as a sum of positive squares in 4 ways, for example, as 5475852001 + 15624250009 = 73999^2 + 124997^2 .

It is not an unprimeable number, because it can be changed into a prime (21100102019) 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, 81154109 + ... + 81154368.

Almost surely, 2^21100102010 is an apocalyptic number.

21100102010 is a deficient number, since it is larger than the sum of its proper divisors (19801634446).

21100102010 is a wasteful number, since it uses less digits than its factorization.

21100102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162308497.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21100102010 its reverse (1020100112), we get a palindrome (22120202122).

The spelling of 21100102010 in words is "twenty-one billion, one hundred million, one hundred two thousand, ten".