13578480238821 has 4 divisors (see below), whose sum is σ = 18104640318432. Its totient is φ = 9052320159212.

The previous prime is 13578480238777. The next prime is 13578480238831. The reversal of 13578480238821 is 12883208487531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13578480238821 - 2¹⁰ = 13578480237797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13578480238831) 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, 2263080039801 + ... + 2263080039806.

It is an arithmetic number, because the mean of its divisors is an integer number (4526160079608).

Almost surely, 2^{13578480238821} is an apocalyptic number.

It is an amenable number.

13578480238821 is a deficient number, since it is larger than the sum of its proper divisors (4526160079611).

13578480238821 is an equidigital number, since it uses as much as digits as its factorization.

13578480238821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526160079610.

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 13578480238821 in words is "thirteen trillion, five hundred seventy-eight billion, four hundred eighty million, two hundred thirty-eight thousand, eight hundred twenty-one".