2211021220 has 12 divisors (see below), whose sum is σ = 4643144604. Its totient is φ = 884408480.

The previous prime is 2211021133. The next prime is 2211021229. The reversal of 2211021220 is 221201122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1450695744 + 760325476 = 38088^2 + 27574^2 .

It is a super-2 number, since 2×2211021220² = 9777229670580576800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2211021220.

It is not an unprimeable number, because it can be changed into a prime (2211021229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55275511 + ... + 55275550.

It is an arithmetic number, because the mean of its divisors is an integer number (386928717).

Almost surely, 2^2211021220 is an apocalyptic number.

2211021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2211021220 is an abundant number, since it is smaller than the sum of its proper divisors (2432123384).

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

2211021220 is a wasteful number, since it uses less digits than its factorization.

2211021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110551070 (or 110551068 counting only the distinct ones).

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

The square root of 2211021220 is about 47021.4974240506. The cubic root of 2211021220 is about 1302.7596642153.

Adding to 2211021220 its reverse (221201122), we get a palindrome (2432222342).

The spelling of 2211021220 in words is "two billion, two hundred eleven million, twenty-one thousand, two hundred twenty".