7123721361 has 16 divisors (see below), whose sum is σ = 10246777344. Its totient is φ = 4385448704.

The previous prime is 7123721347. The next prime is 7123721387. The reversal of 7123721361 is 1631273217.

It is a cyclic number.

It is not a de Polignac number, because 7123721361 - 2¹⁰ = 7123720337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7123725361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1315041 + ... + 1320446.

It is an arithmetic number, because the mean of its divisors is an integer number (640423584).

Almost surely, 2^7123721361 is an apocalyptic number.

It is an amenable number.

7123721361 is a deficient number, since it is larger than the sum of its proper divisors (3123055983).

7123721361 is a wasteful number, since it uses less digits than its factorization.

7123721361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635560.

The product of its digits is 10584, while the sum is 33.

The square root of 7123721361 is about 84402.1407370690. The cubic root of 7123721361 is about 1924.1354512985.

Adding to 7123721361 its reverse (1631273217), we get a palindrome (8754994578).

The spelling of 7123721361 in words is "seven billion, one hundred twenty-three million, seven hundred twenty-one thousand, three hundred sixty-one".