221277 has 16 divisors (see below), whose sum is σ = 346752. Its totient is φ = 122880.

The previous prime is 221261. The next prime is 221281. The reversal of 221277 is 772122.

221277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221277 - 2⁴ = 221261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733 + ... + 989.

It is an arithmetic number, because the mean of its divisors is an integer number (21672).

2²²¹²⁷⁷ is an apocalyptic number.

It is an amenable number.

221277 is a deficient number, since it is larger than the sum of its proper divisors (125475).

221277 is a wasteful number, since it uses less digits than its factorization.

221277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its digits is 392, while the sum is 21.

The square root of 221277 is about 470.4008928563. The cubic root of 221277 is about 60.4846852386.

Adding to 221277 its reverse (772122), we get a palindrome (993399).

The spelling of 221277 in words is "two hundred twenty-one thousand, two hundred seventy-seven", and thus it is an iban number.