75105421 has 2 divisors, whose sum is σ = 75105422. Its totient is φ = 75105420.

The previous prime is 75105413. The next prime is 75105463. The reversal of 75105421 is 12450157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 19900521 = 7430^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 75105421 - 2³ = 75105413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75105491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37552710 + 37552711.

It is an arithmetic number, because the mean of its divisors is an integer number (37552711).

Almost surely, 2^75105421 is an apocalyptic number.

It is an amenable number.

75105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

75105421 is an equidigital number, since it uses as much as digits as its factorization.

75105421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 75105421 is about 8666.3383848082. The cubic root of 75105421 is about 421.9138301781.

Adding to 75105421 its reverse (12450157), we get a palindrome (87555578).

The spelling of 75105421 in words is "seventy-five million, one hundred five thousand, four hundred twenty-one".