221372 has 6 divisors (see below), whose sum is σ = 387408. Its totient is φ = 110684.

The previous prime is 221327. The next prime is 221393. The reversal of 221372 is 273122.

221372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 221372.

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 221372.

It is an unprimeable number.

221372 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27668 + ... + 27675.

It is an arithmetic number, because the mean of its divisors is an integer number (64568).

2²²¹³⁷² is an apocalyptic number.

It is an amenable number.

221372 is a deficient number, since it is larger than the sum of its proper divisors (166036).

221372 is a wasteful number, since it uses less digits than its factorization.

221372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55347 (or 55345 counting only the distinct ones).

The product of its digits is 168, while the sum is 17.

The square root of 221372 is about 470.5018597200. The cubic root of 221372 is about 60.4933398857.

Adding to 221372 its reverse (273122), we get a palindrome (494494).

The spelling of 221372 in words is "two hundred twenty-one thousand, three hundred seventy-two", and thus it is an iban number.