2555021 has 4 divisors (see below), whose sum is σ = 2920032. Its totient is φ = 2190012.

The previous prime is 2555011. The next prime is 2555027. The reversal of 2555021 is 1205552.

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 2555021 - 2¹⁸ = 2292877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2554984 and 2555002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555027) 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, 182495 + ... + 182508.

It is an arithmetic number, because the mean of its divisors is an integer number (730008).

2^2555021 is an apocalyptic number.

It is an amenable number.

2555021 is a deficient number, since it is larger than the sum of its proper divisors (365011).

2555021 is an equidigital number, since it uses as much as digits as its factorization.

2555021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365010.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 2555021 is about 1598.4433052192. The cubic root of 2555021 is about 136.7093309854.

The spelling of 2555021 in words is "two million, five hundred fifty-five thousand, twenty-one".