20421034201100 has 108 divisors (see below), whose sum is σ = 48029526851040. Its totient is φ = 7533014112000.

The previous prime is 20421034201093. The next prime is 20421034201109. The reversal of 20421034201100 is 110243012402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20421034201109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17500925 + ... + 18631275.

Almost surely, 2^{20421034201100} is an apocalyptic number.

20421034201100 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 20421034201100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24014763425520).

20421034201100 is an abundant number, since it is smaller than the sum of its proper divisors (27608492649940).

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

20421034201100 is a wasteful number, since it uses less digits than its factorization.

20421034201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131460 (or 1131440 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20421034201100 its reverse (110243012402), we get a palindrome (20531277213502).

The spelling of 20421034201100 in words is "twenty trillion, four hundred twenty-one billion, thirty-four million, two hundred one thousand, one hundred".