11719721481 has 8 divisors (see below), whose sum is σ = 16828318080. Its totient is φ = 7212136272.

The previous prime is 11719721479. The next prime is 11719721543. The reversal of 11719721481 is 18412791711.

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

It is not a de Polignac number, because 11719721481 - 2¹ = 11719721479 is a prime.

It is a super-2 number, since 2×11719721481² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (11719721471) 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, 150252801 + ... + 150252878.

It is an arithmetic number, because the mean of its divisors is an integer number (2103539760).

Almost surely, 2^11719721481 is an apocalyptic number.

It is an amenable number.

11719721481 is a deficient number, since it is larger than the sum of its proper divisors (5108596599).

11719721481 is a wasteful number, since it uses less digits than its factorization.

11719721481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300505695.

The product of its digits is 28224, while the sum is 42.

The spelling of 11719721481 in words is "eleven billion, seven hundred nineteen million, seven hundred twenty-one thousand, four hundred eighty-one".