11215638215 has 4 divisors (see below), whose sum is σ = 13458765864. Its totient is φ = 8972510568.

The previous prime is 11215638199. The next prime is 11215638221. The reversal of 11215638215 is 51283651211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51283651211 = 13 ⋅3944896247.

It is a cyclic number.

It is not a de Polignac number, because 11215638215 - 2⁴ = 11215638199 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, 1121563817 + ... + 1121563826.

It is an arithmetic number, because the mean of its divisors is an integer number (3364691466).

Almost surely, 2^11215638215 is an apocalyptic number.

11215638215 is a deficient number, since it is larger than the sum of its proper divisors (2243127649).

11215638215 is an equidigital number, since it uses as much as digits as its factorization.

11215638215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243127648.

The product of its digits is 14400, while the sum is 35.

The spelling of 11215638215 in words is "eleven billion, two hundred fifteen million, six hundred thirty-eight thousand, two hundred fifteen".