2021616 has 60 divisors (see below), whose sum is σ = 5754840. Its totient is φ = 662400.

The previous prime is 2021609. The next prime is 2021627. The reversal of 2021616 is 6161202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14475 + ... + 14613.

It is an arithmetic number, because the mean of its divisors is an integer number (95914).

2^2021616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2877420).

2021616 is an abundant number, since it is smaller than the sum of its proper divisors (3733224).

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

2021616 is a wasteful number, since it uses less digits than its factorization.

2021616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2021616 is about 1421.8354335154. The cubic root of 2021616 is about 126.4443870175. Note that the first 3 decimals are identical.

Adding to 2021616 its reverse (6161202), we get a palindrome (8182818).

The spelling of 2021616 in words is "two million, twenty-one thousand, six hundred sixteen".