13818213215 has 4 divisors (see below), whose sum is σ = 16581855864. Its totient is φ = 11054570568.

The previous prime is 13818213209. The next prime is 13818213221. The reversal of 13818213215 is 51231281831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13818213209) and next prime (13818213221).

It is a cyclic number.

It is not a de Polignac number, because 13818213215 - 2¹⁸ = 13817951071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381821317 + ... + 1381821326.

It is an arithmetic number, because the mean of its divisors is an integer number (4145463966).

Almost surely, 2^13818213215 is an apocalyptic number.

13818213215 is a deficient number, since it is larger than the sum of its proper divisors (2763642649).

13818213215 is an equidigital number, since it uses as much as digits as its factorization.

13818213215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763642648.

The product of its digits is 11520, while the sum is 35.

The spelling of 13818213215 in words is "thirteen billion, eight hundred eighteen million, two hundred thirteen thousand, two hundred fifteen".