75003421 has 4 divisors (see below), whose sum is σ = 75081952. Its totient is φ = 74924892.

The previous prime is 75003419. The next prime is 75003443. The reversal of 75003421 is 12430057.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12430057 = 241 ⋅51577.

It is a cyclic number.

It is not a de Polignac number, because 75003421 - 2¹ = 75003419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75003392 and 75003401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75003521) 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, 37815 + ... + 39748.

It is an arithmetic number, because the mean of its divisors is an integer number (18770488).

Almost surely, 2^75003421 is an apocalyptic number.

It is an amenable number.

75003421 is a deficient number, since it is larger than the sum of its proper divisors (78531).

75003421 is an equidigital number, since it uses as much as digits as its factorization.

75003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78530.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 75003421 is about 8660.4515471192. The cubic root of 75003421 is about 421.7227445159.

Adding to 75003421 its reverse (12430057), we get a palindrome (87433478).

The spelling of 75003421 in words is "seventy-five million, three thousand, four hundred twenty-one".