12821574099 has 4 divisors (see below), whose sum is σ = 17095432136. Its totient is φ = 8547716064.

The previous prime is 12821574049. The next prime is 12821574109. The reversal of 12821574099 is 99047512821.

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: 99047512821 = 3 ⋅33015837607.

It is not a de Polignac number, because 12821574099 - 2¹¹ = 12821572051 is a prime.

It is a super-2 number, since 2×12821574099² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12821574049) 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, 2136929014 + ... + 2136929019.

It is an arithmetic number, because the mean of its divisors is an integer number (4273858034).

Almost surely, 2^12821574099 is an apocalyptic number.

12821574099 is a deficient number, since it is larger than the sum of its proper divisors (4273858037).

12821574099 is an equidigital number, since it uses as much as digits as its factorization.

12821574099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273858036.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 12821574099 in words is "twelve billion, eight hundred twenty-one million, five hundred seventy-four thousand, ninety-nine".