11207240721 has 6 divisors (see below), whose sum is σ = 16188236610. Its totient is φ = 7471493808.

The previous prime is 11207240713. The next prime is 11207240729. The reversal of 11207240721 is 12704270211.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11207240713) and next prime (11207240729).

It can be written as a sum of positive squares in only one way, i.e., 10603850625 + 603390096 = 102975^2 + 24564^2 .

It is not a de Polignac number, because 11207240721 - 2³ = 11207240713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11207240729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622624476 + ... + 622624493.

It is an arithmetic number, because the mean of its divisors is an integer number (2698039435).

Almost surely, 2^11207240721 is an apocalyptic number.

It is an amenable number.

11207240721 is a deficient number, since it is larger than the sum of its proper divisors (4980995889).

11207240721 is a wasteful number, since it uses less digits than its factorization.

11207240721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245248975 (or 1245248972 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The spelling of 11207240721 in words is "eleven billion, two hundred seven million, two hundred forty thousand, seven hundred twenty-one".