11854017721 has 48 divisors (see below), whose sum is σ = 15214348800. Its totient is φ = 9150261120.

The previous prime is 11854017719. The next prime is 11854017731. The reversal of 11854017721 is 12771045811.

It is not a de Polignac number, because 11854017721 - 2¹ = 11854017719 is a prime.

It is a super-2 number, since 2×11854017721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11854017731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17933131 + ... + 17933791.

It is an arithmetic number, because the mean of its divisors is an integer number (316965600).

Almost surely, 2^11854017721 is an apocalyptic number.

It is an amenable number.

11854017721 is a deficient number, since it is larger than the sum of its proper divisors (3360331079).

11854017721 is a wasteful number, since it uses less digits than its factorization.

11854017721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 37.

The spelling of 11854017721 in words is "eleven billion, eight hundred fifty-four million, seventeen thousand, seven hundred twenty-one".