11989021 has 8 divisors (see below), whose sum is σ = 13104000. Its totient is φ = 10878240.

The previous prime is 11988997. The next prime is 11989031. The reversal of 11989021 is 12098911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11989021 - 2¹¹ = 11986973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989031) 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 7 ways as a sum of consecutive naturals, for example, 10905 + ... + 11953.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^11989021 is an apocalyptic number.

11989021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11989021 is a deficient number, since it is larger than the sum of its proper divisors (1114979).

11989021 is a wasteful number, since it uses less digits than its factorization.

11989021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 11989021 is about 3462.5165703575. The cubic root of 11989021 is about 228.8730059970.

It can be divided in two parts, 119890 and 21, that added together give a palindrome (119911).

The spelling of 11989021 in words is "eleven million, nine hundred eighty-nine thousand, twenty-one".