7206142321 has 27 divisors (see below), whose sum is σ = 8556911307. Its totient is φ = 6050887920.

The previous prime is 7206142309. The next prime is 7206142327. The reversal of 7206142321 is 1232416027.

The square root of 7206142321 is 84889.

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

It can be written as a sum of positive squares in only one way, i.e., 79405921 + 7126736400 = 8911^2 + 84420^2 .

It is not a de Polignac number, because 7206142321 - 2⁷ = 7206142193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7206142321.

It is not an unprimeable number, because it can be changed into a prime (7206142327) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 39812851 + ... + 39813031.

It is an arithmetic number, because the mean of its divisors is an integer number (316922641).

Almost surely, 2^7206142321 is an apocalyptic number.

7206142321 is the 84889-th square number.

7206142321 is the 42445-th centered octagonal number.

It is an amenable number.

7206142321 is a deficient number, since it is larger than the sum of its proper divisors (1350768986).

7206142321 is an frugal number, since it uses more digits than its factorization.

7206142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The cubic root of 7206142321 is about 1931.5277192231.

Adding to 7206142321 its reverse (1232416027), we get a palindrome (8438558348).

The spelling of 7206142321 in words is "seven billion, two hundred six million, one hundred forty-two thousand, three hundred twenty-one".