20021101100 has 216 divisors, whose sum is σ = 59376543408. Its totient is φ = 5760115200.

The previous prime is 20021101033. The next prime is 20021101147. The reversal of 20021101100 is 110112002.

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, 686414 + ... + 714986.

Almost surely, 2^20021101100 is an apocalyptic number.

20021101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021101100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29688271704).

20021101100 is an abundant number, since it is smaller than the sum of its proper divisors (39355442308).

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

20021101100 is a wasteful number, since it uses less digits than its factorization.

20021101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28625 (or 28611 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20021101100 its reverse (110112002), we get a palindrome (20131213102).

It can be divided in two parts, 20021 and 101100, that added together give a palindrome (121121).

The spelling of 20021101100 in words is "twenty billion, twenty-one million, one hundred one thousand, one hundred".