151324021 has 4 divisors (see below), whose sum is σ = 160225452. Its totient is φ = 142422592.

The previous prime is 151324013. The next prime is 151324057. The reversal of 151324021 is 120423151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120423151 = 491 ⋅245261.

It can be written as a sum of positive squares in 2 ways, for example, as 123876900 + 27447121 = 11130^2 + 5239^2 .

It is a cyclic number.

It is not a de Polignac number, because 151324021 - 2³ = 151324013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151324021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151324081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4450690 + ... + 4450723.

It is an arithmetic number, because the mean of its divisors is an integer number (40056363).

Almost surely, 2^151324021 is an apocalyptic number.

It is an amenable number.

151324021 is a deficient number, since it is larger than the sum of its proper divisors (8901431).

151324021 is an equidigital number, since it uses as much as digits as its factorization.

151324021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901430.

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

The square root of 151324021 is about 12301.3828897405. The cubic root of 151324021 is about 532.8880209501. Note that the first 3 decimals are identical.

Adding to 151324021 its reverse (120423151), we get a palindrome (271747172).

The spelling of 151324021 in words is "one hundred fifty-one million, three hundred twenty-four thousand, twenty-one".