204421220420 has 12 divisors (see below), whose sum is σ = 429284562924. Its totient is φ = 81768488160.

The previous prime is 204421220387. The next prime is 204421220447. The reversal of 204421220420 is 24022124402.

It can be written as a sum of positive squares in 2 ways, for example, as 88057001536 + 116364218884 = 296744^2 + 341122^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5110530491 + ... + 5110530530.

It is an arithmetic number, because the mean of its divisors is an integer number (35773713577).

Almost surely, 2^204421220420 is an apocalyptic number.

204421220420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204421220420 is an abundant number, since it is smaller than the sum of its proper divisors (224863342504).

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

204421220420 is a wasteful number, since it uses less digits than its factorization.

204421220420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221061030 (or 10221061028 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 204421220420 its reverse (24022124402), we get a palindrome (228443344822).

The spelling of 204421220420 in words is "two hundred four billion, four hundred twenty-one million, two hundred twenty thousand, four hundred twenty".