20100111102 has 48 divisors (see below), whose sum is σ = 46671973920. Its totient is φ = 6235517376.

The previous prime is 20100111071. The next prime is 20100111151. The reversal of 20100111102 is 20111100102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640777 + ... + 671412.

It is an arithmetic number, because the mean of its divisors is an integer number (972332790).

Almost surely, 2^20100111102 is an apocalyptic number.

20100111102 is an abundant number, since it is smaller than the sum of its proper divisors (26571862818).

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

20100111102 is a wasteful number, since it uses less digits than its factorization.

20100111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312257 (or 1312254 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20100111102 its reverse (20111100102), we get a palindrome (40211211204).

The spelling of 20100111102 in words is "twenty billion, one hundred million, one hundred eleven thousand, one hundred two".