2021650 has 12 divisors (see below), whose sum is σ = 3760362. Its totient is φ = 808640.

The previous prime is 2021647. The next prime is 2021651. The reversal of 2021650 is 561202.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1117249 + 904401 = 1057^2 + 951^2 .

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2021651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20167 + ... + 20266.

2^2021650 is an apocalyptic number.

2021650 is a deficient number, since it is larger than the sum of its proper divisors (1738712).

2021650 is a wasteful number, since it uses less digits than its factorization.

2021650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40445 (or 40440 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2021650 is about 1421.8473898418. The cubic root of 2021650 is about 126.4450958704.

Adding to 2021650 its reverse (561202), we get a palindrome (2582852).

The spelling of 2021650 in words is "two million, twenty-one thousand, six hundred fifty".