20021112100 has 36 divisors (see below), whose sum is σ = 47395435248. Its totient is φ = 7280404000.

The previous prime is 20021112077. The next prime is 20021112103. The reversal of 20021112100 is 121112002.

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

It is not an unprimeable number, because it can be changed into a prime (20021112103) by changing a digit.

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, 9099406 + ... + 9101605.

It is an arithmetic number, because the mean of its divisors is an integer number (1316539868).

Almost surely, 2^20021112100 is an apocalyptic number.

20021112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021112100 is an abundant number, since it is smaller than the sum of its proper divisors (27374323148).

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

20021112100 is a wasteful number, since it uses less digits than its factorization.

20021112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201036 (or 18201029 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021112100 its reverse (121112002), we get a palindrome (20142224102).

The spelling of 20021112100 in words is "twenty billion, twenty-one million, one hundred twelve thousand, one hundred".