20211111100 has 36 divisors (see below), whose sum is σ = 44016503944. Its totient is φ = 8055247680.

The previous prime is 20211111073. The next prime is 20211111203. The reversal of 20211111100 is 111111202.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337122 + ... + 392521.

Almost surely, 2^20211111100 is an apocalyptic number.

20211111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211111100 is an abundant number, since it is smaller than the sum of its proper divisors (23805392844).

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

20211111100 is a wasteful number, since it uses less digits than its factorization.

20211111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729934 (or 729927 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20211111100 its reverse (111111202), we get a palindrome (20322222302).

The spelling of 20211111100 in words is "twenty billion, two hundred eleven million, one hundred eleven thousand, one hundred".