75023021 has 2 divisors, whose sum is σ = 75023022. Its totient is φ = 75023020.

The previous prime is 75023009. The next prime is 75023051. The reversal of 75023021 is 12032057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 546121 = 8630^2 + 739^2 .

It is an emirp because it is prime and its reverse (12032057) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75023021 - 2²² = 70828717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 75022984 and 75023002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75023051) 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 as a sum of consecutive naturals, namely, 37511510 + 37511511.

It is an arithmetic number, because the mean of its divisors is an integer number (37511511).

Almost surely, 2^75023021 is an apocalyptic number.

It is an amenable number.

75023021 is a deficient number, since it is larger than the sum of its proper divisors (1).

75023021 is an equidigital number, since it uses as much as digits as its factorization.

75023021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 75023021 is about 8661.5830539226. The cubic root of 75023021 is about 421.7594763778.

Adding to 75023021 its reverse (12032057), we get a palindrome (87055078).

The spelling of 75023021 in words is "seventy-five million, twenty-three thousand, twenty-one".