11211178987 has 4 divisors (see below), whose sum is σ = 11422710720. Its totient is φ = 10999647256.

The previous prime is 11211178973. The next prime is 11211179027. The reversal of 11211178987 is 78987111211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78987111211 = 44699 ⋅1767089.

It is a cyclic number.

It is not a de Polignac number, because 11211178987 - 2¹⁹ = 11210654699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211178907) 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, 105765787 + ... + 105765892.

It is an arithmetic number, because the mean of its divisors is an integer number (2855677680).

Almost surely, 2^11211178987 is an apocalyptic number.

11211178987 is a deficient number, since it is larger than the sum of its proper divisors (211531733).

11211178987 is an equidigital number, since it uses as much as digits as its factorization.

11211178987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211531732.

The product of its digits is 56448, while the sum is 46.

The spelling of 11211178987 in words is "eleven billion, two hundred eleven million, one hundred seventy-eight thousand, nine hundred eighty-seven".