20111000021100 has 108 divisors (see below), whose sum is σ = 63071396047296. Its totient is φ = 5359991084160.

The previous prime is 20111000021089. The next prime is 20111000021149. The reversal of 20111000021100 is 112000011102.

It is a happy number.

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

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, 4488087 + ... + 7769486.

Almost surely, 2^{20111000021100} is an apocalyptic number.

20111000021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111000021100 is an abundant number, since it is smaller than the sum of its proper divisors (42960396026196).

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

20111000021100 is a wasteful number, since it uses less digits than its factorization.

20111000021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12259416 (or 12259406 counting only the distinct ones).

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

Adding to 20111000021100 its reverse (112000011102), we get a palindrome (20223000032202).

The spelling of 20111000021100 in words is "twenty trillion, one hundred eleven billion, twenty-one thousand, one hundred".