11630545921 has 4 divisors (see below), whose sum is σ = 11636564692. Its totient is φ = 11624527152.

The previous prime is 11630545919. The next prime is 11630545951. The reversal of 11630545921 is 12954503611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12954503611 = 7 ⋅1850643373.

It can be written as a sum of positive squares in 2 ways, for example, as 3738711025 + 7891834896 = 61145^2 + 88836^2 .

It is a cyclic number.

It is not a de Polignac number, because 11630545921 - 2¹ = 11630545919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11630545951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3006486 + ... + 3010351.

It is an arithmetic number, because the mean of its divisors is an integer number (2909141173).

Almost surely, 2^11630545921 is an apocalyptic number.

It is an amenable number.

11630545921 is a deficient number, since it is larger than the sum of its proper divisors (6018771).

11630545921 is an equidigital number, since it uses as much as digits as its factorization.

11630545921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6018770.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 11630545921 in words is "eleven billion, six hundred thirty million, five hundred forty-five thousand, nine hundred twenty-one".