150221515 has 4 divisors (see below), whose sum is σ = 180265824. Its totient is φ = 120177208.

The previous prime is 150221501. The next prime is 150221521. The reversal of 150221515 is 515122051.

It is a happy number.

150221515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 150221515 - 2⁷ = 150221387 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15022147 + ... + 15022156.

It is an arithmetic number, because the mean of its divisors is an integer number (45066456).

Almost surely, 2^150221515 is an apocalyptic number.

150221515 is a deficient number, since it is larger than the sum of its proper divisors (30044309).

150221515 is an equidigital number, since it uses as much as digits as its factorization.

150221515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30044308.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 150221515 is about 12256.4886896696. The cubic root of 150221515 is about 531.5907057397.

Adding to 150221515 its reverse (515122051), we get a palindrome (665343566).

The spelling of 150221515 in words is "one hundred fifty million, two hundred twenty-one thousand, five hundred fifteen".