2021646 has 16 divisors (see below), whose sum is σ = 4411008. Its totient is φ = 612600.

The previous prime is 2021639. The next prime is 2021647. The reversal of 2021646 is 6461202.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15250 + ... + 15381.

It is an arithmetic number, because the mean of its divisors is an integer number (275688).

2^2021646 is an apocalyptic number.

2021646 is an abundant number, since it is smaller than the sum of its proper divisors (2389362).

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

2021646 is a wasteful number, since it uses less digits than its factorization.

2021646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30647.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2021646 is about 1421.8459832204. The cubic root of 2021646 is about 126.4450124764.

Adding to 2021646 its reverse (6461202), we get a palindrome (8482848).

The spelling of 2021646 in words is "two million, twenty-one thousand, six hundred forty-six".