11721081 has 8 divisors (see below), whose sum is σ = 16450720. Its totient is φ = 7402752.

The previous prime is 11721079. The next prime is 11721107. The reversal of 11721081 is 18012711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11721081 - 2¹ = 11721079 is a prime.

It is a super-2 number, since 2×11721081² = 274767479617122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (11721781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102760 + ... + 102873.

It is an arithmetic number, because the mean of its divisors is an integer number (2056340).

Almost surely, 2^11721081 is an apocalyptic number.

It is an amenable number.

11721081 is a deficient number, since it is larger than the sum of its proper divisors (4729639).

11721081 is a wasteful number, since it uses less digits than its factorization.

11721081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205655.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 11721081 is about 3423.6064318201. The cubic root of 11721081 is about 227.1551334010.

Adding to 11721081 its reverse (18012711), we get a palindrome (29733792).

The spelling of 11721081 in words is "eleven million, seven hundred twenty-one thousand, eighty-one".