11467889921 has 4 divisors (see below), whose sum is σ = 11468184000. Its totient is φ = 11467595844.

The previous prime is 11467889843. The next prime is 11467889929. The reversal of 11467889921 is 12998876411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12998876411 = 421 ⋅30876191.

It is a cyclic number.

It is not a de Polignac number, because 11467889921 - 2¹⁴ = 11467873537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11467889929) 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, 77621 + ... + 170178.

It is an arithmetic number, because the mean of its divisors is an integer number (2867046000).

Almost surely, 2^11467889921 is an apocalyptic number.

It is an amenable number.

11467889921 is a deficient number, since it is larger than the sum of its proper divisors (294079).

11467889921 is an equidigital number, since it uses as much as digits as its factorization.

11467889921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294078.

The product of its digits is 1741824, while the sum is 56.

The spelling of 11467889921 in words is "eleven billion, four hundred sixty-seven million, eight hundred eighty-nine thousand, nine hundred twenty-one".