20421242424120 has 128 divisors (see below), whose sum is σ = 65076055050240. Its totient is φ = 5108851107840.

The previous prime is 20421242424041. The next prime is 20421242424139. The reversal of 20421242424120 is 2142424212402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15459472 + ... + 16728351.

It is an arithmetic number, because the mean of its divisors is an integer number (508406680080).

Almost surely, 2^{20421242424120} is an apocalyptic number.

20421242424120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421242424120 is an abundant number, since it is smaller than the sum of its proper divisors (44654812626120).

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

20421242424120 is a wasteful number, since it uses less digits than its factorization.

20421242424120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32188165 (or 32188161 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 20421242424120 its reverse (2142424212402), we get a palindrome (22563666636522).

The spelling of 20421242424120 in words is "twenty trillion, four hundred twenty-one billion, two hundred forty-two million, four hundred twenty-four thousand, one hundred twenty".