221269 has 4 divisors (see below), whose sum is σ = 222220. Its totient is φ = 220320.

The previous prime is 221261. The next prime is 221281. The reversal of 221269 is 962122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 152100 + 69169 = 390^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 221269 - 2³ = 221261 is a prime.

It is a super-2 number, since 2×221269² = 97919940722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221261) 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, 139 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (55555).

2²²¹²⁶⁹ is an apocalyptic number.

It is an amenable number.

221269 is a deficient number, since it is larger than the sum of its proper divisors (951).

221269 is an equidigital number, since it uses as much as digits as its factorization.

221269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950.

The product of its digits is 432, while the sum is 22.

The square root of 221269 is about 470.3923893942. The cubic root of 221269 is about 60.4839563132.

It can be divided in two parts, 2212 and 69, that multiplied together give a triangular number (152628 = T₅₅₂).

The spelling of 221269 in words is "two hundred twenty-one thousand, two hundred sixty-nine".