153020221 has 2 divisors, whose sum is σ = 153020222. Its totient is φ = 153020220.

The previous prime is 153020209. The next prime is 153020239. The reversal of 153020221 is 122020351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145805625 + 7214596 = 12075^2 + 2686^2 .

It is an emirp because it is prime and its reverse (122020351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 153020221 - 2⁷ = 153020093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 153020195 and 153020204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (153020201) 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, 76510110 + 76510111.

It is an arithmetic number, because the mean of its divisors is an integer number (76510111).

Almost surely, 2^153020221 is an apocalyptic number.

It is an amenable number.

153020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

153020221 is an equidigital number, since it uses as much as digits as its factorization.

153020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 153020221 is about 12370.1342353266. The cubic root of 153020221 is about 534.8716855346.

Adding to 153020221 its reverse (122020351), we get a palindrome (275040572).

The spelling of 153020221 in words is "one hundred fifty-three million, twenty thousand, two hundred twenty-one".