75071021 has 8 divisors (see below), whose sum is σ = 76434720. Its totient is φ = 73714608.

The previous prime is 75070939. The next prime is 75071023. The reversal of 75071021 is 12017057.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75071021 - 2¹⁰ = 75069997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75071023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21635 + ... + 24863.

It is an arithmetic number, because the mean of its divisors is an integer number (9554340).

Almost surely, 2^75071021 is an apocalyptic number.

It is an amenable number.

75071021 is a deficient number, since it is larger than the sum of its proper divisors (1363699).

75071021 is a wasteful number, since it uses less digits than its factorization.

75071021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3643.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 75071021 is about 8664.3534669357. The cubic root of 75071021 is about 421.8494049474.

Adding to 75071021 its reverse (12017057), we get a palindrome (87088078).

The spelling of 75071021 in words is "seventy-five million, seventy-one thousand, twenty-one".