7125210721 has 8 divisors (see below), whose sum is σ = 7165080000. Its totient is φ = 7085382480.

The previous prime is 7125210689. The next prime is 7125210737. The reversal of 7125210721 is 1270125217.

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 7125210721 - 2⁵ = 7125210689 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 7125210721.

It is not an unprimeable number, because it can be changed into a prime (7125210761) 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, 378666 + ... + 397036.

It is an arithmetic number, because the mean of its divisors is an integer number (895635000).

Almost surely, 2^7125210721 is an apocalyptic number.

It is an amenable number.

7125210721 is a deficient number, since it is larger than the sum of its proper divisors (39869279).

7125210721 is a wasteful number, since it uses less digits than its factorization.

7125210721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20519.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 7125210721 is about 84410.9632749206. The cubic root of 7125210721 is about 1924.2695352761.

Adding to 7125210721 its reverse (1270125217), we get a palindrome (8395335938).

The spelling of 7125210721 in words is "seven billion, one hundred twenty-five million, two hundred ten thousand, seven hundred twenty-one".