152221221 has 8 divisors (see below), whose sum is σ = 225512960. Its totient is φ = 101480796.

The previous prime is 152221207. The next prime is 152221259. The reversal of 152221221 is 122122251.

It is not a de Polignac number, because 152221221 - 2⁵ = 152221189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 152221194 and 152221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152221271) 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, 2818885 + ... + 2818938.

It is an arithmetic number, because the mean of its divisors is an integer number (28189120).

Almost surely, 2^152221221 is an apocalyptic number.

It is an amenable number.

152221221 is a deficient number, since it is larger than the sum of its proper divisors (73291739).

152221221 is an equidigital number, since it uses as much as digits as its factorization.

152221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637832 (or 5637826 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 152221221 is about 12337.7964402076. The cubic root of 152221221 is about 533.9391105930.

Adding to 152221221 its reverse (122122251), we get a palindrome (274343472).

The spelling of 152221221 in words is "one hundred fifty-two million, two hundred twenty-one thousand, two hundred twenty-one".