260021 has 4 divisors (see below), whose sum is σ = 266112. Its totient is φ = 253932.

The previous prime is 260017. The next prime is 260023. The reversal of 260021 is 120062.

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 260021 - 2² = 260017 is a prime.

It is a super-2 number, since 2×260021² = 135221840882, which contains 22 as substring.

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 = 259984 and 260011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260023) 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, 2981 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2²⁶⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

260021 is a deficient number, since it is larger than the sum of its proper divisors (6091).

260021 is an equidigital number, since it uses as much as digits as its factorization.

260021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6090.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 260021 is about 509.9225431377. The cubic root of 260021 is about 63.8267613089.

Adding to 260021 its reverse (120062), we get a palindrome (380083).

The spelling of 260021 in words is "two hundred sixty thousand, twenty-one".