220121220424 has 64 divisors (see below), whose sum is σ = 477279216000. Its totient is φ = 93223104000.

The previous prime is 220121220379. The next prime is 220121220433. The reversal of 220121220424 is 424022121022.

It is a junction number, because it is equal to n+sod(n) for n = 220121220395 and 220121220404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2909427 + ... + 2984125.

It is an arithmetic number, because the mean of its divisors is an integer number (7457487750).

Almost surely, 2^220121220424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220121220424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238639608000).

220121220424 is an abundant number, since it is smaller than the sum of its proper divisors (257157995576).

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

220121220424 is a wasteful number, since it uses less digits than its factorization.

220121220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75334 (or 75330 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 220121220424 its reverse (424022121022), we get a palindrome (644143341446).

The spelling of 220121220424 in words is "two hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, four hundred twenty-four".