2021255 has 4 divisors (see below), whose sum is σ = 2425512. Its totient is φ = 1617000.

The previous prime is 2021251. The next prime is 2021291. The reversal of 2021255 is 5521202.

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

It is not a de Polignac number, because 2021255 - 2² = 2021251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202121 + ... + 202130.

It is an arithmetic number, because the mean of its divisors is an integer number (606378).

2^2021255 is an apocalyptic number.

2021255 is a deficient number, since it is larger than the sum of its proper divisors (404257).

2021255 is an equidigital number, since it uses as much as digits as its factorization.

2021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404256.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 2021255 is about 1421.7084792601. The cubic root of 2021255 is about 126.4368601774.

Subtracting from 2021255 its product of nonzero digits (200), we obtain a triangular number (2021055 = T₂₀₁₀).

Adding to 2021255 its reverse (5521202), we get a palindrome (7542457).

The spelling of 2021255 in words is "two million, twenty-one thousand, two hundred fifty-five".