2021535 has 24 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 1067712.

The previous prime is 2021533. The next prime is 2021549. The reversal of 2021535 is 5351202.

It is a happy number.

It is not a de Polignac number, because 2021535 - 2¹ = 2021533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7381 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (147420).

2^2021535 is an apocalyptic number.

2021535 is a deficient number, since it is larger than the sum of its proper divisors (1516545).

2021535 is a wasteful number, since it uses less digits than its factorization.

2021535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 2021535 is about 1421.8069489210. The cubic root of 2021535 is about 126.4426982477.

Adding to 2021535 its reverse (5351202), we get a palindrome (7372737).

It can be divided in two parts, 2021 and 535, that added together give a triangular number (2556 = T₇₁).

The spelling of 2021535 in words is "two million, twenty-one thousand, five hundred thirty-five".