11481385621 has 4 divisors (see below), whose sum is σ = 11877295500. Its totient is φ = 11085475744.

The previous prime is 11481385609. The next prime is 11481385633. The reversal of 11481385621 is 12658318411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12658318411 = 6229 ⋅2032159.

It is an interprime number because it is at equal distance from previous prime (11481385609) and next prime (11481385633).

It can be written as a sum of positive squares in 2 ways, for example, as 8092981521 + 3388404100 = 89961^2 + 58210^2 .

It is a cyclic number.

It is not a de Polignac number, because 11481385621 - 2²⁷ = 11347167893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11481385651) 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, 197954896 + ... + 197954953.

It is an arithmetic number, because the mean of its divisors is an integer number (2969323875).

Almost surely, 2^11481385621 is an apocalyptic number.

It is an amenable number.

11481385621 is a deficient number, since it is larger than the sum of its proper divisors (395909879).

11481385621 is an equidigital number, since it uses as much as digits as its factorization.

11481385621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395909878.

The product of its digits is 46080, while the sum is 40.

The spelling of 11481385621 in words is "eleven billion, four hundred eighty-one million, three hundred eighty-five thousand, six hundred twenty-one".