2021616444 has 12 divisors (see below), whose sum is σ = 4717105064. Its totient is φ = 673872144.

The previous prime is 2021616439. The next prime is 2021616449. The reversal of 2021616444 is 4446161202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021616439) and next prime (2021616449).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021616449) 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, 84234007 + ... + 84234030.

Almost surely, 2^2021616444 is an apocalyptic number.

It is an amenable number.

2021616444 is an abundant number, since it is smaller than the sum of its proper divisors (2695488620).

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

2021616444 is a wasteful number, since it uses less digits than its factorization.

2021616444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168468044 (or 168468042 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 2021616444 is about 44962.3892158769. The cubic root of 2021616444 is about 1264.4439627435.

Adding to 2021616444 its reverse (4446161202), we get a palindrome (6467777646).

The spelling of 2021616444 in words is "two billion, twenty-one million, six hundred sixteen thousand, four hundred forty-four".