20421024333400 has 96 divisors (see below), whose sum is σ = 47671053768000. Its totient is φ = 8135367864320.

The previous prime is 20421024333397. The next prime is 20421024333401. The reversal of 20421024333400 is 433342012402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421024333401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167741352 + ... + 167863048.

It is an arithmetic number, because the mean of its divisors is an integer number (496573476750).

Almost surely, 2^{20421024333400} is an apocalyptic number.

20421024333400 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 20421024333400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23835526884000).

20421024333400 is an abundant number, since it is smaller than the sum of its proper divisors (27250029434600).

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

20421024333400 is a wasteful number, since it uses less digits than its factorization.

20421024333400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125101 (or 125092 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20421024333400 its reverse (433342012402), we get a palindrome (20854366345802).

The spelling of 20421024333400 in words is "twenty trillion, four hundred twenty-one billion, twenty-four million, three hundred thirty-three thousand, four hundred".