75012921 has 9 divisors (see below), whose sum is σ = 108389541. Its totient is φ = 49991292.

The previous prime is 75012919. The next prime is 75012929. The reversal of 75012921 is 12921057.

The square root of 75012921 is 8661.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 75012921 - 2¹ = 75012919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75012929) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24540 + ... + 27426.

Almost surely, 2^75012921 is an apocalyptic number.

75012921 is the 8661-st square number.

75012921 is the 4331-st centered octagonal number.

It is an amenable number.

75012921 is a deficient number, since it is larger than the sum of its proper divisors (33376620).

75012921 is an frugal number, since it uses more digits than its factorization.

75012921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The cubic root of 75012921 is about 421.7405490235.

Adding to 75012921 its reverse (12921057), we get a palindrome (87933978).

The spelling of 75012921 in words is "seventy-five million, twelve thousand, nine hundred twenty-one".