11215971 has 24 divisors (see below), whose sum is σ = 18476640. Its totient is φ = 6494976.

The previous prime is 11215969. The next prime is 11215987. The reversal of 11215971 is 17951211.

It is not a de Polignac number, because 11215971 - 2¹ = 11215969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11215931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 831 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (769860).

Almost surely, 2^11215971 is an apocalyptic number.

11215971 is a deficient number, since it is larger than the sum of its proper divisors (7260669).

11215971 is a wasteful number, since it uses less digits than its factorization.

11215971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5675 (or 5672 counting only the distinct ones).

The product of its digits is 630, while the sum is 27.

The square root of 11215971 is about 3349.0253806145. The cubic root of 11215971 is about 223.8440866028.

The spelling of 11215971 in words is "eleven million, two hundred fifteen thousand, nine hundred seventy-one".