152921 has 4 divisors (see below), whose sum is σ = 157092. Its totient is φ = 148752.

The previous prime is 152909. The next prime is 152939. The reversal of 152921 is 129251.

152921 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, and also an emirpimes, since its reverse is a distinct semiprime: 129251 = 17 ⋅7603.

It can be written as a sum of positive squares in 2 ways, for example, as 126025 + 26896 = 355^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 152921 - 2⁶ = 152857 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 152893 and 152902.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 152921.

It is not an unprimeable number, because it can be changed into a prime (152941) 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, 2030 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (39273).

2¹⁵²⁹²¹ is an apocalyptic number.

It is an amenable number.

152921 is a deficient number, since it is larger than the sum of its proper divisors (4171).

152921 is an equidigital number, since it uses as much as digits as its factorization.

152921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170.

The product of its digits is 180, while the sum is 20.

The square root of 152921 is about 391.0511475498. The cubic root of 152921 is about 53.4756053805.

The spelling of 152921 in words is "one hundred fifty-two thousand, nine hundred twenty-one".