2201221020 has 48 divisors (see below), whose sum is σ = 6330004128. Its totient is φ = 571127040.

The previous prime is 2201221019. The next prime is 2201221027. The reversal of 2201221020 is 201221022.

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 = 2201220987 and 2201221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201221027) 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, 493551 + ... + 497990.

It is an arithmetic number, because the mean of its divisors is an integer number (131875086).

Almost surely, 2^2201221020 is an apocalyptic number.

2201221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2201221020 is an abundant number, since it is smaller than the sum of its proper divisors (4128783108).

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

2201221020 is a wasteful number, since it uses less digits than its factorization.

2201221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991590 (or 991588 counting only the distinct ones).

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

The square root of 2201221020 is about 46917.1719096537. The cubic root of 2201221020 is about 1300.8320157098.

Adding to 2201221020 its reverse (201221022), we get a palindrome (2402442042).

The spelling of 2201221020 in words is "two billion, two hundred one million, two hundred twenty-one thousand, twenty".