221977 has 8 divisors (see below), whose sum is σ = 267200. Its totient is φ = 180144.

The previous prime is 221957. The next prime is 221987. The reversal of 221977 is 779122.

It is a happy number.

221977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221977 - 2⁷ = 221849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702 + ... + 967.

It is an arithmetic number, because the mean of its divisors is an integer number (33400).

2²²¹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

221977 is a deficient number, since it is larger than the sum of its proper divisors (45223).

221977 is a wasteful number, since it uses less digits than its factorization.

221977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695.

The product of its digits is 1764, while the sum is 28.

The square root of 221977 is about 471.1443515527. The cubic root of 221977 is about 60.5483983099.

The spelling of 221977 in words is "two hundred twenty-one thousand, nine hundred seventy-seven".