12111621 has 8 divisors (see below), whose sum is σ = 16198944. Its totient is φ = 8049360.

The previous prime is 12111601. The next prime is 12111707. The reversal of 12111621 is 12611121.

It is a happy number.

12111621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12111621 - 2¹⁰ = 12110597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12111621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5106 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (2024868).

Almost surely, 2^12111621 is an apocalyptic number.

It is an amenable number.

12111621 is a deficient number, since it is larger than the sum of its proper divisors (4087323).

12111621 is a wasteful number, since it uses less digits than its factorization.

12111621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12531.

The product of its digits is 24, while the sum is 15.

The square root of 12111621 is about 3480.1754266129. The cubic root of 12111621 is about 229.6505152259.

Adding to 12111621 its reverse (12611121), we get a palindrome (24722742).

Subtracting 12111621 from its reverse (12611121), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 12111621 in words is "twelve million, one hundred eleven thousand, six hundred twenty-one".