11754661921 has 4 divisors (see below), whose sum is σ = 11755843092. Its totient is φ = 11753480752.

The previous prime is 11754661913. The next prime is 11754661943. The reversal of 11754661921 is 12916645711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12916645711 = 93263 ⋅138497.

It can be written as a sum of positive squares in 2 ways, for example, as 1721835025 + 10032826896 = 41495^2 + 100164^2 .

It is a cyclic number.

It is not a de Polignac number, because 11754661921 - 2³ = 11754661913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11754667921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575530 + ... + 595603.

It is an arithmetic number, because the mean of its divisors is an integer number (2938960773).

Almost surely, 2^11754661921 is an apocalyptic number.

It is an amenable number.

11754661921 is a deficient number, since it is larger than the sum of its proper divisors (1181171).

11754661921 is a wasteful number, since it uses less digits than its factorization.

11754661921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181170.

The product of its digits is 90720, while the sum is 43.

The spelling of 11754661921 in words is "eleven billion, seven hundred fifty-four million, six hundred sixty-one thousand, nine hundred twenty-one".