20021200100 has 36 divisors (see below), whose sum is σ = 47395643568. Its totient is φ = 7280436000.

The previous prime is 20021200081. The next prime is 20021200117. The reversal of 20021200100 is 100212002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9099446 + ... + 9101645.

Almost surely, 2^20021200100 is an apocalyptic number.

20021200100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021200100 is an abundant number, since it is smaller than the sum of its proper divisors (27374443468).

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

20021200100 is a wasteful number, since it uses less digits than its factorization.

20021200100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18201116 (or 18201109 counting only the distinct ones).

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

Adding to 20021200100 its reverse (100212002), we get a palindrome (20121412102).

The spelling of 20021200100 in words is "twenty billion, twenty-one million, two hundred thousand, one hundred".