153305021 has 2 divisors, whose sum is σ = 153305022. Its totient is φ = 153305020.

The previous prime is 153305011. The next prime is 153305039. The reversal of 153305021 is 120503351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93799225 + 59505796 = 9685^2 + 7714^2 .

It is an emirp because it is prime and its reverse (120503351) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153305021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 153304984 and 153305002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (153305011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76652510 + 76652511.

It is an arithmetic number, because the mean of its divisors is an integer number (76652511).

Almost surely, 2^153305021 is an apocalyptic number.

It is an amenable number.

153305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

153305021 is an equidigital number, since it uses as much as digits as its factorization.

153305021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 153305021 is about 12381.6404809702. The cubic root of 153305021 is about 535.2033128333.

Adding to 153305021 its reverse (120503351), we get a palindrome (273808372).

The spelling of 153305021 in words is "one hundred fifty-three million, three hundred five thousand, twenty-one".