75345421 has 4 divisors (see below), whose sum is σ = 75483712. Its totient is φ = 75207132.

The previous prime is 75345409. The next prime is 75345433. The reversal of 75345421 is 12454357.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (75345409) and next prime (75345433).

It is a cyclic number.

It is not a de Polignac number, because 75345421 - 2²¹ = 73248269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75345481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68325 + ... + 69418.

It is an arithmetic number, because the mean of its divisors is an integer number (18870928).

Almost surely, 2^75345421 is an apocalyptic number.

It is an amenable number.

75345421 is a deficient number, since it is larger than the sum of its proper divisors (138291).

75345421 is a wasteful number, since it uses less digits than its factorization.

75345421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138290.

The product of its digits is 16800, while the sum is 31.

The square root of 75345421 is about 8680.1740189929. The cubic root of 75345421 is about 422.3627620511.

Adding to 75345421 its reverse (12454357), we get a palindrome (87799778).

The spelling of 75345421 in words is "seventy-five million, three hundred forty-five thousand, four hundred twenty-one".