2021635 has 32 divisors (see below), whose sum is σ = 3110400. Its totient is φ = 1224960.

The previous prime is 2021629. The next prime is 2021639. The reversal of 2021635 is 5361202.

It is a happy number.

It is not a de Polignac number, because 2021635 - 2³ = 2021627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021639) 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 31 ways as a sum of consecutive naturals, for example, 22671 + ... + 22759.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2^2021635 is an apocalyptic number.

2021635 is a deficient number, since it is larger than the sum of its proper divisors (1088765).

2021635 is a wasteful number, since it uses less digits than its factorization.

2021635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2021635 is about 1421.8421150043. The cubic root of 2021635 is about 126.4447831422. Note that the first 3 decimals are identical.

Adding to 2021635 its reverse (5361202), we get a palindrome (7382837).

The spelling of 2021635 in words is "two million, twenty-one thousand, six hundred thirty-five".