20021100101100 has 216 divisors, whose sum is σ = 71723050264320. Its totient is φ = 4576058720640.

The previous prime is 20021100101083. The next prime is 20021100101129. The reversal of 20021100101100 is 110100112002.

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 71 ways as a sum of consecutive naturals, for example, 194360209 + ... + 194463191.

Almost surely, 2^{20021100101100} is an apocalyptic number.

20021100101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021100101100 is an abundant number, since it is smaller than the sum of its proper divisors (51701950163220).

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

20021100101100 is a wasteful number, since it uses less digits than its factorization.

20021100101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133869 (or 133859 counting only the distinct ones).

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

Adding to 20021100101100 its reverse (110100112002), we get a palindrome (20131200213102).

The spelling of 20021100101100 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred one thousand, one hundred".