152021321 has 4 divisors (see below), whose sum is σ = 152083332. Its totient is φ = 151959312.

The previous prime is 152021263. The next prime is 152021323. The reversal of 152021321 is 123120251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123120251 = 31 ⋅3971621.

It can be written as a sum of positive squares in 2 ways, for example, as 96727225 + 55294096 = 9835^2 + 7436^2 .

It is a cyclic number.

It is not a de Polignac number, because 152021321 - 2⁶ = 152021257 is a prime.

It is a super-2 number, since 2×152021321² = 46220964077170082, which contains 22 as substring.

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 152021321.

It is not an unprimeable number, because it can be changed into a prime (152021323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27170 + ... + 32283.

It is an arithmetic number, because the mean of its divisors is an integer number (38020833).

Almost surely, 2^152021321 is an apocalyptic number.

It is an amenable number.

152021321 is a deficient number, since it is larger than the sum of its proper divisors (62011).

152021321 is an equidigital number, since it uses as much as digits as its factorization.

152021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62010.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 152021321 is about 12329.6926563479. The cubic root of 152021321 is about 533.7052816442.

Adding to 152021321 its reverse (123120251), we get a palindrome (275141572).

The spelling of 152021321 in words is "one hundred fifty-two million, twenty-one thousand, three hundred twenty-one".