76221 has 10 divisors (see below), whose sum is σ = 113982. Its totient is φ = 50760.

The previous prime is 76213. The next prime is 76231. The reversal of 76221 is 12267.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68121 + 8100 = 261^2 + 90^2 .

It is not a de Polignac number, because 76221 - 2³ = 76213 is a prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 76194 and 76203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76231) 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, 390 + ... + 551.

2⁷⁶²²¹ is an apocalyptic number.

It is an amenable number.

76221 is a deficient number, since it is larger than the sum of its proper divisors (37761).

76221 is an equidigital number, since it uses as much as digits as its factorization.

76221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 944 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 76221 is about 276.0815097032. The cubic root of 76221 is about 42.3992538732.

Adding to 76221 its reverse (12267), we get a palindrome (88488).

The spelling of 76221 in words is "seventy-six thousand, two hundred twenty-one".