75234421 has 4 divisors (see below), whose sum is σ = 75739500. Its totient is φ = 74729344.

The previous prime is 75234407. The next prime is 75234463. The reversal of 75234421 is 12443257.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34975396 + 40259025 = 5914^2 + 6345^2 .

It is a cyclic number.

It is not a de Polignac number, because 75234421 - 2¹¹ = 75232373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75234421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75234491) 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, 252316 + ... + 252613.

It is an arithmetic number, because the mean of its divisors is an integer number (18934875).

Almost surely, 2^75234421 is an apocalyptic number.

It is an amenable number.

75234421 is a deficient number, since it is larger than the sum of its proper divisors (505079).

75234421 is a wasteful number, since it uses less digits than its factorization.

75234421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505078.

The product of its digits is 6720, while the sum is 28.

The square root of 75234421 is about 8673.7777813361. Note that the first 4 decimals coincide. The cubic root of 75234421 is about 422.1552497370.

Adding to 75234421 its reverse (12443257), we get a palindrome (87677678).

The spelling of 75234421 in words is "seventy-five million, two hundred thirty-four thousand, four hundred twenty-one".