20102111100 has 108 divisors (see below), whose sum is σ = 64712002264. Its totient is φ = 5215674240.

The previous prime is 20102111069. The next prime is 20102111111. The reversal of 20102111100 is 111120102.

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 35 ways as a sum of consecutive naturals, for example, 268534 + ... + 335133.

Almost surely, 2^20102111100 is an apocalyptic number.

20102111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102111100 is an abundant number, since it is smaller than the sum of its proper divisors (44609891164).

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

20102111100 is a wasteful number, since it uses less digits than its factorization.

20102111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603724 (or 603714 counting only the distinct ones).

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

Adding to 20102111100 its reverse (111120102), we get a palindrome (20213231202).

The spelling of 20102111100 in words is "twenty billion, one hundred two million, one hundred eleven thousand, one hundred".