150720321 has 4 divisors (see below), whose sum is σ = 200960432. Its totient is φ = 100480212.

The previous prime is 150720263. The next prime is 150720379. The reversal of 150720321 is 123027051.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (150720263) and next prime (150720379).

It is not a de Polignac number, because 150720321 - 2¹⁵ = 150687553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (150720391) 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, 25120051 + ... + 25120056.

It is an arithmetic number, because the mean of its divisors is an integer number (50240108).

Almost surely, 2^150720321 is an apocalyptic number.

It is an amenable number.

150720321 is a deficient number, since it is larger than the sum of its proper divisors (50240111).

150720321 is an equidigital number, since it uses as much as digits as its factorization.

150720321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50240110.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 150720321 is about 12276.8204760027. The cubic root of 150720321 is about 532.1784326659.

Adding to 150720321 its reverse (123027051), we get a palindrome (273747372).

The spelling of 150720321 in words is "one hundred fifty million, seven hundred twenty thousand, three hundred twenty-one".