7258210721 has 8 divisors (see below), whose sum is σ = 7378826088. Its totient is φ = 7137648000.

The previous prime is 7258210697. The next prime is 7258210723. The reversal of 7258210721 is 1270128527.

It can be written as a sum of positive squares in 4 ways, for example, as 1591132321 + 5667078400 = 39889^2 + 75280^2 .

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 7258210721 - 2⁶ = 7258210657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7258210723) 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, 344861 + ... + 365301.

It is an arithmetic number, because the mean of its divisors is an integer number (922353261).

Almost surely, 2^7258210721 is an apocalyptic number.

It is an amenable number.

7258210721 is a deficient number, since it is larger than the sum of its proper divisors (120615367).

7258210721 is a wasteful number, since it uses less digits than its factorization.

7258210721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26323.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 7258210721 is about 85195.1332002011. The cubic root of 7258210721 is about 1936.1686811773.

The spelling of 7258210721 in words is "seven billion, two hundred fifty-eight million, two hundred ten thousand, seven hundred twenty-one".