11364547921 has 4 divisors (see below), whose sum is σ = 11366919844. Its totient is φ = 11362176000.

The previous prime is 11364547913. The next prime is 11364547933. The reversal of 11364547921 is 12974546311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12974546311 = 23531 ⋅551381.

It can be written as a sum of positive squares in 2 ways, for example, as 4048140625 + 7316407296 = 63625^2 + 85536^2 .

It is a cyclic number.

It is not a de Polignac number, because 11364547921 - 2³ = 11364547913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11364541921) 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, 1178760 + ... + 1188361.

It is an arithmetic number, because the mean of its divisors is an integer number (2841729961).

Almost surely, 2^11364547921 is an apocalyptic number.

It is an amenable number.

11364547921 is a deficient number, since it is larger than the sum of its proper divisors (2371923).

11364547921 is an equidigital number, since it uses as much as digits as its factorization.

11364547921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371922.

The product of its digits is 181440, while the sum is 43.

The spelling of 11364547921 in words is "eleven billion, three hundred sixty-four million, five hundred forty-seven thousand, nine hundred twenty-one".