201220243420 has 96 divisors (see below), whose sum is σ = 492968448000. Its totient is φ = 68964017472.

The previous prime is 201220243391. The next prime is 201220243421. The reversal of 201220243420 is 24342022102.

It is a junction number, because it is equal to n+sod(n) for n = 201220243391 and 201220243400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220243421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31820379 + ... + 31826701.

It is an arithmetic number, because the mean of its divisors is an integer number (5135088000).

Almost surely, 2^201220243420 is an apocalyptic number.

201220243420 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 201220243420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246484224000).

201220243420 is an abundant number, since it is smaller than the sum of its proper divisors (291748204580).

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

201220243420 is a wasteful number, since it uses less digits than its factorization.

201220243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10992 (or 10976 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 201220243420 its reverse (24342022102), we get a palindrome (225562265522).

The spelling of 201220243420 in words is "two hundred one billion, two hundred twenty million, two hundred forty-three thousand, four hundred twenty".