75010021 has 2 divisors, whose sum is σ = 75010022. Its totient is φ = 75010020.

The previous prime is 75009997. The next prime is 75010031. The reversal of 75010021 is 12001057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67881121 + 7128900 = 8239^2 + 2670^2 .

It is an emirp because it is prime and its reverse (12001057) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75010021 - 2¹¹ = 75007973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75009977 and 75010004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75010031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37505010 + 37505011.

It is an arithmetic number, because the mean of its divisors is an integer number (37505011).

Almost surely, 2^75010021 is an apocalyptic number.

It is an amenable number.

75010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

75010021 is an equidigital number, since it uses as much as digits as its factorization.

75010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 75010021 is about 8660.8325812245. The cubic root of 75010021 is about 421.7351141227.

Adding to 75010021 its reverse (12001057), we get a palindrome (87011078).

The spelling of 75010021 in words is "seventy-five million, ten thousand, twenty-one".