20030021100 has 216 divisors, whose sum is σ = 64691172000. Its totient is φ = 5180544000.

The previous prime is 20030021071. The next prime is 20030021101. The reversal of 20030021100 is 112003002.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (20030021101) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6677401 + ... + 6680399.

Almost surely, 2^20030021100 is an apocalyptic number.

20030021100 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 20030021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32345586000).

20030021100 is an abundant number, since it is smaller than the sum of its proper divisors (44661150900).

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

20030021100 is a wasteful number, since it uses less digits than its factorization.

20030021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241 (or 3231 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20030021100 its reverse (112003002), we get a palindrome (20142024102).

The spelling of 20030021100 in words is "twenty billion, thirty million, twenty-one thousand, one hundred".