2563021 has 4 divisors (see below), whose sum is σ = 2581600. Its totient is φ = 2544444.

The previous prime is 2563013. The next prime is 2563063. The reversal of 2563021 is 1203652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2563021 - 2³ = 2563013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2563021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9081 + ... + 9358.

It is an arithmetic number, because the mean of its divisors is an integer number (645400).

2^2563021 is an apocalyptic number.

It is an amenable number.

2563021 is a deficient number, since it is larger than the sum of its proper divisors (18579).

2563021 is a wasteful number, since it uses less digits than its factorization.

2563021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18578.

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

The square root of 2563021 is about 1600.9437841473. The cubic root of 2563021 is about 136.8518653866.

Adding to 2563021 its reverse (1203652), we get a palindrome (3766673).

It can be divided in two parts, 25630 and 21, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2563021 in words is "two million, five hundred sixty-three thousand, twenty-one".