1021255 has 4 divisors (see below), whose sum is σ = 1225512. Its totient is φ = 817000.

The previous prime is 1021253. The next prime is 1021259. The reversal of 1021255 is 5521201.

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

It is not a de Polignac number, because 1021255 - 2¹ = 1021253 is a prime.

It is a Duffinian number.

1021255 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021253) 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, 102121 + ... + 102130.

It is an arithmetic number, because the mean of its divisors is an integer number (306378).

2^1021255 is an apocalyptic number.

1021255 is a deficient number, since it is larger than the sum of its proper divisors (204257).

1021255 is an equidigital number, since it uses as much as digits as its factorization.

1021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204256.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1021255 is about 1010.5716204208. The cubic root of 1021255 is about 100.7035387250.

Adding to 1021255 its reverse (5521201), we get a palindrome (6542456).

The spelling of 1021255 in words is "one million, twenty-one thousand, two hundred fifty-five".