11846867921 has 4 divisors (see below), whose sum is σ = 13539277632. Its totient is φ = 10154458212.

The previous prime is 11846867917. The next prime is 11846867933. The reversal of 11846867921 is 12976864811.

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: 12976864811 = 4129 ⋅3142859.

It is a cyclic number.

It is not a de Polignac number, because 11846867921 - 2² = 11846867917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11846867941) 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, 846204845 + ... + 846204858.

It is an arithmetic number, because the mean of its divisors is an integer number (3384819408).

Almost surely, 2^11846867921 is an apocalyptic number.

It is an amenable number.

11846867921 is a deficient number, since it is larger than the sum of its proper divisors (1692409711).

11846867921 is an equidigital number, since it uses as much as digits as its factorization.

11846867921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692409710.

The product of its digits is 1161216, while the sum is 53.

The spelling of 11846867921 in words is "eleven billion, eight hundred forty-six million, eight hundred sixty-seven thousand, nine hundred twenty-one".