201221220 has 24 divisors (see below), whose sum is σ = 563419584. Its totient is φ = 53658976.

The previous prime is 201221219. The next prime is 201221243. The reversal of 201221220 is 22122102.

201221220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 201221196 and 201221205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676784 + ... + 1676903.

It is an arithmetic number, because the mean of its divisors is an integer number (23475816).

Almost surely, 2^201221220 is an apocalyptic number.

201221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221220 is an abundant number, since it is smaller than the sum of its proper divisors (362198364).

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

201221220 is a wasteful number, since it uses less digits than its factorization.

201221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353699 (or 3353697 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 201221220 is about 14185.2465611282. The cubic root of 201221220 is about 585.9914227992.

Adding to 201221220 its reverse (22122102), we get a palindrome (223343322).

It can be divided in two parts, 2012 and 21220, that added together give a palindrome (23232).

The spelling of 201221220 in words is "two hundred one million, two hundred twenty-one thousand, two hundred twenty".