75454021 has 4 divisors (see below), whose sum is σ = 75778092. Its totient is φ = 75129952.

The previous prime is 75454019. The next prime is 75454037. The reversal of 75454021 is 12045457.

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 47416996 + 28037025 = 6886^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 75454021 - 2¹ = 75454019 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 (75454061) 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, 161686 + ... + 162151.

It is an arithmetic number, because the mean of its divisors is an integer number (18944523).

Almost surely, 2^75454021 is an apocalyptic number.

It is an amenable number.

75454021 is a deficient number, since it is larger than the sum of its proper divisors (324071).

75454021 is a wasteful number, since it uses less digits than its factorization.

75454021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324070.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 75454021 is about 8686.4274014119. The cubic root of 75454021 is about 422.5655904612.

Adding to 75454021 its reverse (12045457), we get a palindrome (87499478).

The spelling of 75454021 in words is "seventy-five million, four hundred fifty-four thousand, twenty-one".