11121621 has 16 divisors (see below), whose sum is σ = 17944704. Its totient is φ = 5981184.

The previous prime is 11121613. The next prime is 11121629. The reversal of 11121621 is 12612111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11121613) and next prime (11121629).

It is not a de Polignac number, because 11121621 - 2³ = 11121613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11121621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15220 + ... + 15933.

It is an arithmetic number, because the mean of its divisors is an integer number (1121544).

Almost surely, 2^11121621 is an apocalyptic number.

It is an amenable number.

11121621 is a deficient number, since it is larger than the sum of its proper divisors (6823083).

11121621 is a wasteful number, since it uses less digits than its factorization.

11121621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31180.

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

The square root of 11121621 is about 3334.9094440479. The cubic root of 11121621 is about 223.2146511817.

Adding to 11121621 its reverse (12612111), we get a palindrome (23733732).

The spelling of 11121621 in words is "eleven million, one hundred twenty-one thousand, six hundred twenty-one".