11671021 has 16 divisors (see below), whose sum is σ = 12654000. Its totient is φ = 10741248.

The previous prime is 11671013. The next prime is 11671031. The reversal of 11671021 is 12017611.

It can be written as a sum of positive squares in 8 ways, for example, as 36100 + 11634921 = 190^2 + 3411^2 .

It is not a de Polignac number, because 11671021 - 2³ = 11671013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11671021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11671001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78255 + ... + 78403.

It is an arithmetic number, because the mean of its divisors is an integer number (790875).

Almost surely, 2^11671021 is an apocalyptic number.

It is an amenable number.

11671021 is a deficient number, since it is larger than the sum of its proper divisors (982979).

11671021 is a wasteful number, since it uses less digits than its factorization.

11671021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 11671021 is about 3416.2876049888. The cubic root of 11671021 is about 226.8312834841.

Adding to 11671021 its reverse (12017611), we get a palindrome (23688632).

The spelling of 11671021 in words is "eleven million, six hundred seventy-one thousand, twenty-one".