221469 has 4 divisors (see below), whose sum is σ = 295296. Its totient is φ = 147644.

The previous prime is 221461. The next prime is 221471. The reversal of 221469 is 964122.

221469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221469 - 2³ = 221461 is a prime.

It is a super-2 number, since 2×221469² = 98097035922, which contains 22 as substring.

It is a D-number.

221469 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221469.

It is not an unprimeable number, because it can be changed into a prime (221461) 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, 36909 + ... + 36914.

It is an arithmetic number, because the mean of its divisors is an integer number (73824).

2²²¹⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

221469 is a deficient number, since it is larger than the sum of its proper divisors (73827).

221469 is an equidigital number, since it uses as much as digits as its factorization.

221469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73826.

The product of its digits is 864, while the sum is 24.

The square root of 221469 is about 470.6049298509. The cubic root of 221469 is about 60.5021741814.

Subtracting from 221469 its sum of digits (24), we obtain a triangular number (221445 = T₆₆₅).

It can be divided in two parts, 22146 and 9, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 221469 in words is "two hundred twenty-one thousand, four hundred sixty-nine".