421042021220 has 24 divisors (see below), whose sum is σ = 930724468800. Its totient is φ = 159552765792.

The previous prime is 421042021199. The next prime is 421042021229. The reversal of 421042021220 is 22120240124.

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

It is a junction number, because it is equal to n+sod(n) for n = 421042021192 and 421042021201.

It is not an unprimeable number, because it can be changed into a prime (421042021229) 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, 554002280 + ... + 554003039.

It is an arithmetic number, because the mean of its divisors is an integer number (38780186200).

Almost surely, 2^421042021220 is an apocalyptic number.

It is an amenable number.

421042021220 is an abundant number, since it is smaller than the sum of its proper divisors (509682447580).

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

421042021220 is a wasteful number, since it uses less digits than its factorization.

421042021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108005347 (or 1108005345 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 421042021220 its reverse (22120240124), we get a palindrome (443162261344).

The spelling of 421042021220 in words is "four hundred twenty-one billion, forty-two million, twenty-one thousand, two hundred twenty".