202421201220 has 144 divisors (see below), whose sum is σ = 701949725568. Its totient is φ = 46253007360.

The previous prime is 202421201207. The next prime is 202421201221. The reversal of 202421201220 is 22102124202.

202421201220 is a `hidden beast` number, since 2 + 0 + 2 + 421 + 20 + 1 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 202421201193 and 202421201202.

It is not an unprimeable number, because it can be changed into a prime (202421201221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4223632 + ... + 4271288.

It is an arithmetic number, because the mean of its divisors is an integer number (4874650872).

Almost surely, 2^202421201220 is an apocalyptic number.

202421201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202421201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350974862784).

202421201220 is an abundant number, since it is smaller than the sum of its proper divisors (499528524348).

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

202421201220 is a wasteful number, since it uses less digits than its factorization.

202421201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51050 (or 51045 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 202421201220 its reverse (22102124202), we get a palindrome (224523325422).

The spelling of 202421201220 in words is "two hundred two billion, four hundred twenty-one million, two hundred one thousand, two hundred twenty".