11211987 has 12 divisors (see below), whose sum is σ = 15451080. Its totient is φ = 7231680.

The previous prime is 11211961. The next prime is 11211989. The reversal of 11211987 is 78911211.

11211987 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11211987 - 2⁶ = 11211923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 939 + ... + 4827.

It is an arithmetic number, because the mean of its divisors is an integer number (1287590).

Almost surely, 2^11211987 is an apocalyptic number.

11211987 is a deficient number, since it is larger than the sum of its proper divisors (4239093).

11211987 is an equidigital number, since it uses as much as digits as its factorization.

11211987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954 (or 3923 counting only the distinct ones).

The product of its digits is 1008, while the sum is 30.

The square root of 11211987 is about 3348.4305278742. The cubic root of 11211987 is about 223.8175797448.

The spelling of 11211987 in words is "eleven million, two hundred eleven thousand, nine hundred eighty-seven".