152221321 has 8 divisors (see below), whose sum is σ = 174265344. Its totient is φ = 130251840.

The previous prime is 152221271. The next prime is 152221339. The reversal of 152221321 is 123122251.

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 152221321 - 2⁷ = 152221193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152221021) 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, 14185 + ... + 22486.

It is an arithmetic number, because the mean of its divisors is an integer number (21783168).

Almost surely, 2^152221321 is an apocalyptic number.

It is an amenable number.

152221321 is a deficient number, since it is larger than the sum of its proper divisors (22044023).

152221321 is an equidigital number, since it uses as much as digits as its factorization.

152221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37271.

The product of its digits is 240, while the sum is 19.

The square root of 152221321 is about 12337.8004927945. The cubic root of 152221321 is about 533.9392275147.

Adding to 152221321 its reverse (123122251), we get a palindrome (275343572).

The spelling of 152221321 in words is "one hundred fifty-two million, two hundred twenty-one thousand, three hundred twenty-one".