2201211220 has 48 divisors (see below), whose sum is σ = 4988203920. Its totient is φ = 811109376.

The previous prime is 2201211197. The next prime is 2201211227. The reversal of 2201211220 is 221121022.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 188073796 + 2013137424 = 13714^2 + 44868^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 2201211220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201211227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124024 + ... + 140656.

It is an arithmetic number, because the mean of its divisors is an integer number (103920915).

Almost surely, 2^2201211220 is an apocalyptic number.

2201211220 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 2201211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2494101960).

2201211220 is an abundant number, since it is smaller than the sum of its proper divisors (2786992700).

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

2201211220 is a wasteful number, since it uses less digits than its factorization.

2201211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17164 (or 17162 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2201211220 is about 46917.0674701648. The cubic root of 2201211220 is about 1300.8300852399.

Adding to 2201211220 its reverse (221121022), we get a palindrome (2422332242).

The spelling of 2201211220 in words is "two billion, two hundred one million, two hundred eleven thousand, two hundred twenty".