11461889921 has 4 divisors (see below), whose sum is σ = 11462201172. Its totient is φ = 11461578672.

The previous prime is 11461889917. The next prime is 11461889941. The reversal of 11461889921 is 12998816411.

11461889921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4264743025 + 7197146896 = 65305^2 + 84836^2 .

It is a cyclic number.

It is not a de Polignac number, because 11461889921 - 2² = 11461889917 is a prime.

It is a super-2 number, since 2×11461889921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11461889921.

It is not an unprimeable number, because it can be changed into a prime (11461889941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91610 + ... + 176963.

It is an arithmetic number, because the mean of its divisors is an integer number (2865550293).

Almost surely, 2^11461889921 is an apocalyptic number.

It is an amenable number.

11461889921 is a deficient number, since it is larger than the sum of its proper divisors (311251).

11461889921 is an equidigital number, since it uses as much as digits as its factorization.

11461889921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311250.

The product of its digits is 248832, while the sum is 50.

The spelling of 11461889921 in words is "eleven billion, four hundred sixty-one million, eight hundred eighty-nine thousand, nine hundred twenty-one".