11721244720 has 40 divisors (see below), whose sum is σ = 27290463120. Its totient is φ = 4681862400.

The previous prime is 11721244699. The next prime is 11721244727. The reversal of 11721244720 is 2744212711.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×11721244720² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11721244727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46606 + ... + 160045.

It is an arithmetic number, because the mean of its divisors is an integer number (682261578).

Almost surely, 2^11721244720 is an apocalyptic number.

11721244720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11721244720 is an abundant number, since it is smaller than the sum of its proper divisors (15569218400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11721244720 is a wasteful number, since it uses less digits than its factorization.

11721244720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207373 (or 207367 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The spelling of 11721244720 in words is "eleven billion, seven hundred twenty-one million, two hundred forty-four thousand, seven hundred twenty".