262421 has 4 divisors (see below), whose sum is σ = 271500. Its totient is φ = 253344.

The previous prime is 262411. The next prime is 262433. The reversal of 262421 is 124262.

262421 = T₃₀ + T₃₁ + ... + T₁₁₆.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124262 = 2 ⋅62131.

It can be written as a sum of positive squares in 2 ways, for example, as 180625 + 81796 = 425^2 + 286^2 .

It is not a de Polignac number, because 262421 - 2¹⁸ = 277 is a prime.

It is a super-3 number, since 3×262421³ = 54214694274133383, which contains 333 as substring.

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 262421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (262411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496 + ... + 4553.

It is an arithmetic number, because the mean of its divisors is an integer number (67875).

2²⁶²⁴²¹ is an apocalyptic number.

It is an amenable number.

262421 is a deficient number, since it is larger than the sum of its proper divisors (9079).

262421 is an equidigital number, since it uses as much as digits as its factorization.

262421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9078.

The product of its digits is 192, while the sum is 17.

The square root of 262421 is about 512.2704363908. The cubic root of 262421 is about 64.0225343824.

Adding to 262421 its reverse (124262), we get a palindrome (386683).

The spelling of 262421 in words is "two hundred sixty-two thousand, four hundred twenty-one".