21100102002010 has 16 divisors (see below), whose sum is σ = 38356225027272. Its totient is φ = 8356476040000.

The previous prime is 21100102001963. The next prime is 21100102002013. The reversal of 21100102002010 is 1020020100112.

It can be written as a sum of positive squares in 4 ways, for example, as 16177441250161 + 4922660751849 = 4022119^2 + 2218707^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21100102002013) 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, 10445594041 + ... + 10445596060.

Almost surely, 2^{21100102002010} is an apocalyptic number.

21100102002010 is a deficient number, since it is larger than the sum of its proper divisors (17256123025262).

21100102002010 is a wasteful number, since it uses less digits than its factorization.

21100102002010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20891190209.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100102002010 its reverse (1020020100112), we get a palindrome (22120122102122).

The spelling of 21100102002010 in words is "twenty-one trillion, one hundred billion, one hundred two million, two thousand, ten".