2021506 has 4 divisors (see below), whose sum is σ = 3032262. Its totient is φ = 1010752.

The previous prime is 2021501. The next prime is 2021507. The reversal of 2021506 is 6051202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1713481 + 308025 = 1309^2 + 555^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2021506.

It is not an unprimeable number, because it can be changed into a prime (2021501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505375 + ... + 505378.

2^2021506 is an apocalyptic number.

2021506 is a deficient number, since it is larger than the sum of its proper divisors (1010756).

2021506 is a wasteful number, since it uses less digits than its factorization.

2021506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010755.

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

The square root of 2021506 is about 1421.7967505941. The cubic root of 2021506 is about 126.4420936155.

Adding to 2021506 its reverse (6051202), we get a palindrome (8072708).

The spelling of 2021506 in words is "two million, twenty-one thousand, five hundred six".