221954 has 4 divisors (see below), whose sum is σ = 332934. Its totient is φ = 110976.

The previous prime is 221953. The next prime is 221957. The reversal of 221954 is 459122.

221954 = 271² + 272² + 273².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 459122 = 2 ⋅229561.

It can be written as a sum of positive squares in only one way, i.e., 172225 + 49729 = 415^2 + 223^2 .

It is a Curzon number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (221951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55487 + ... + 55490.

2²²¹⁹⁵⁴ is an apocalyptic number.

221954 is a deficient number, since it is larger than the sum of its proper divisors (110980).

221954 is a wasteful number, since it uses less digits than its factorization.

221954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110979.

The product of its digits is 720, while the sum is 23.

The square root of 221954 is about 471.1199422652. The cubic root of 221954 is about 60.5463070103.

The spelling of 221954 in words is "two hundred twenty-one thousand, nine hundred fifty-four".