2220144021 has 6 divisors (see below), whose sum is σ = 3206874710. Its totient is φ = 1480096008.

The previous prime is 2220144013. The next prime is 2220144037. The reversal of 2220144021 is 1204410222.

2220144021 is a `hidden beast` number, since 2 + 2 + 201 + 440 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1465817796 + 754326225 = 38286^2 + 27465^2 .

It is not a de Polignac number, because 2220144021 - 2³ = 2220144013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220143985 and 2220144003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220144011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123341326 + ... + 123341343.

Almost surely, 2^2220144021 is an apocalyptic number.

It is an amenable number.

2220144021 is a deficient number, since it is larger than the sum of its proper divisors (986730689).

2220144021 is a wasteful number, since it uses less digits than its factorization.

2220144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246682675 (or 246682672 counting only the distinct ones).

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

The square root of 2220144021 is about 47118.4042705183. The cubic root of 2220144021 is about 1304.5489593778.

Adding to 2220144021 its reverse (1204410222), we get a palindrome (3424554243).

The spelling of 2220144021 in words is "two billion, two hundred twenty million, one hundred forty-four thousand, twenty-one".