221454 has 20 divisors (see below), whose sum is σ = 496584. Its totient is φ = 73764.

The previous prime is 221453. The next prime is 221461. The reversal of 221454 is 454122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221453) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 522 + ... + 845.

2²²¹⁴⁵⁴ is an apocalyptic number.

221454 is an abundant number, since it is smaller than the sum of its proper divisors (275130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221454 is a wasteful number, since it uses less digits than its factorization.

221454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 1372 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 221454 is about 470.5889926464. The cubic root of 221454 is about 60.5008082218.

Adding to 221454 its reverse (454122), we get a palindrome (675576).

The spelling of 221454 in words is "two hundred twenty-one thousand, four hundred fifty-four".