20421123421120 has 56 divisors (see below), whose sum is σ = 48701590938000. Its totient is φ = 8156054065152.

The previous prime is 20421123421087. The next prime is 20421123421121. The reversal of 20421123421120 is 2112432112402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421123421121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48207945 + ... + 48629704.

It is an arithmetic number, because the mean of its divisors is an integer number (869671266750).

Almost surely, 2^{20421123421120} is an apocalyptic number.

20421123421120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421123421120 is an abundant number, since it is smaller than the sum of its proper divisors (28280467516880).

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

20421123421120 is an equidigital number, since it uses as much as digits as its factorization.

20421123421120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96838325 (or 96838315 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 20421123421120 its reverse (2112432112402), we get a palindrome (22533555533522).

The spelling of 20421123421120 in words is "twenty trillion, four hundred twenty-one billion, one hundred twenty-three million, four hundred twenty-one thousand, one hundred twenty".