153221 has 4 divisors (see below), whose sum is σ = 162252. Its totient is φ = 144192.

The previous prime is 153191. The next prime is 153247. The reversal of 153221 is 122351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122351 = 29 ⋅4219.

It can be written as a sum of positive squares in 2 ways, for example, as 96100 + 57121 = 310^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 153221 - 2¹⁰ = 152197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 153196 and 153205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4490 + ... + 4523.

It is an arithmetic number, because the mean of its divisors is an integer number (40563).

2¹⁵³²²¹ is an apocalyptic number.

It is an amenable number.

153221 is a deficient number, since it is larger than the sum of its proper divisors (9031).

153221 is an equidigital number, since it uses as much as digits as its factorization.

153221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9030.

The product of its digits is 60, while the sum is 14.

The square root of 153221 is about 391.4345411432. The cubic root of 153221 is about 53.5105519700.

Adding to 153221 its reverse (122351), we get a palindrome (275572).

The spelling of 153221 in words is "one hundred fifty-three thousand, two hundred twenty-one".