11721526381 has 8 divisors (see below), whose sum is σ = 11856633984. Its totient is φ = 11586828720.

The previous prime is 11721526373. The next prime is 11721526387. The reversal of 11721526381 is 18362512711.

11721526381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11721526381 - 2³ = 11721526373 is a prime.

It is a super-2 number, since 2×11721526381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11721526381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721526387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44785 + ... + 159526.

It is an arithmetic number, because the mean of its divisors is an integer number (1482079248).

Almost surely, 2^11721526381 is an apocalyptic number.

It is an amenable number.

11721526381 is a deficient number, since it is larger than the sum of its proper divisors (135107603).

11721526381 is a wasteful number, since it uses less digits than its factorization.

11721526381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204971.

The product of its digits is 20160, while the sum is 37.

The spelling of 11721526381 in words is "eleven billion, seven hundred twenty-one million, five hundred twenty-six thousand, three hundred eighty-one".