201240212220 has 144 divisors (see below), whose sum is σ = 618004296000. Its totient is φ = 52999474176.

The previous prime is 201240212213. The next prime is 201240212267. The reversal of 201240212220 is 22212042102.

201240212220 is a `hidden beast` number, since 20 + 12 + 402 + 12 + 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 = 201240212193 and 201240212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14715546 + ... + 14729214.

It is an arithmetic number, because the mean of its divisors is an integer number (4291696500).

Almost surely, 2^201240212220 is an apocalyptic number.

201240212220 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 201240212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309002148000).

201240212220 is an abundant number, since it is smaller than the sum of its proper divisors (416764083780).

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

201240212220 is a wasteful number, since it uses less digits than its factorization.

201240212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14692 (or 14687 counting only the distinct ones).

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

Adding to 201240212220 its reverse (22212042102), we get a palindrome (223452254322).

The spelling of 201240212220 in words is "two hundred one billion, two hundred forty million, two hundred twelve thousand, two hundred twenty".