20421211100 has 18 divisors (see below), whose sum is σ = 44314028304. Its totient is φ = 8168484400.

The previous prime is 20421211099. The next prime is 20421211123. The reversal of 20421211100 is 111212402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102105956 + ... + 102106155.

Almost surely, 2^20421211100 is an apocalyptic number.

20421211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421211100 is an abundant number, since it is smaller than the sum of its proper divisors (23892817204).

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

20421211100 is a wasteful number, since it uses less digits than its factorization.

20421211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204212125 (or 204212118 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20421211100 its reverse (111212402), we get a palindrome (20532423502).

The spelling of 20421211100 in words is "twenty billion, four hundred twenty-one million, two hundred eleven thousand, one hundred".