11969233921 has 4 divisors (see below), whose sum is σ = 12049564500. Its totient is φ = 11888903344.

The previous prime is 11969233919. The next prime is 11969233931. The reversal of 11969233921 is 12933296911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 709689600 + 11259544321 = 26640^2 + 106111^2 .

It is a cyclic number.

It is not a de Polignac number, because 11969233921 - 2¹ = 11969233919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11969233931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40165066 + ... + 40165363.

It is an arithmetic number, because the mean of its divisors is an integer number (3012391125).

Almost surely, 2^11969233921 is an apocalyptic number.

It is an amenable number.

11969233921 is a deficient number, since it is larger than the sum of its proper divisors (80330579).

11969233921 is an equidigital number, since it uses as much as digits as its factorization.

11969233921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80330578.

The product of its digits is 157464, while the sum is 46.

The spelling of 11969233921 in words is "eleven billion, nine hundred sixty-nine million, two hundred thirty-three thousand, nine hundred twenty-one".