152106821 has 4 divisors (see below), whose sum is σ = 152181792. Its totient is φ = 152031852.

The previous prime is 152106809. The next prime is 152106833. The reversal of 152106821 is 128601251.

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 (152106809) and next prime (152106833).

It is a cyclic number.

It is not a de Polignac number, because 152106821 - 2¹⁴ = 152090437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152106881) 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, 34355 + ... + 38528.

It is an arithmetic number, because the mean of its divisors is an integer number (38045448).

Almost surely, 2^152106821 is an apocalyptic number.

It is an amenable number.

152106821 is a deficient number, since it is larger than the sum of its proper divisors (74971).

152106821 is an equidigital number, since it uses as much as digits as its factorization.

152106821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74970.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 152106821 is about 12333.1594086836. The cubic root of 152106821 is about 533.8053185978.

The spelling of 152106821 in words is "one hundred fifty-two million, one hundred six thousand, eight hundred twenty-one".