20110221102100 has 18 divisors (see below), whose sum is σ = 43639179791774. Its totient is φ = 8044088440800.

The previous prime is 20110221102079. The next prime is 20110221102113. The reversal of 20110221102100 is 120112201102.

It can be written as a sum of positive squares in 3 ways, for example, as 6099378574864 + 14010842527236 = 2469692^2 + 3743106^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100551105411 + ... + 100551105610.

Almost surely, 2^{20110221102100} is an apocalyptic number.

20110221102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20110221102100 is an abundant number, since it is smaller than the sum of its proper divisors (23528958689674).

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

20110221102100 is a wasteful number, since it uses less digits than its factorization.

20110221102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201102211035 (or 201102211028 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20110221102100 its reverse (120112201102), we get a palindrome (20230333303202).

The spelling of 20110221102100 in words is "twenty trillion, one hundred ten billion, two hundred twenty-one million, one hundred two thousand, one hundred".