152521021 has 2 divisors, whose sum is σ = 152521022. Its totient is φ = 152521020.

The previous prime is 152521013. The next prime is 152521079. The reversal of 152521021 is 120125251.

152521021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141372100 + 11148921 = 11890^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 152521021 - 2³ = 152521013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 152521021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (152521001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76260510 + 76260511.

It is an arithmetic number, because the mean of its divisors is an integer number (76260511).

Almost surely, 2^152521021 is an apocalyptic number.

It is an amenable number.

152521021 is a deficient number, since it is larger than the sum of its proper divisors (1).

152521021 is an equidigital number, since it uses as much as digits as its factorization.

152521021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 152521021 is about 12349.9401213123. The cubic root of 152521021 is about 534.2894121034.

Adding to 152521021 its reverse (120125251), we get a palindrome (272646272).

The spelling of 152521021 in words is "one hundred fifty-two million, five hundred twenty-one thousand, twenty-one".