11911621 has 4 divisors (see below), whose sum is σ = 11919232. Its totient is φ = 11904012.

The previous prime is 11911619. The next prime is 11911639. The reversal of 11911621 is 12611911.

11911621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12611911 = 13 ⋅970147.

It is a cyclic number.

It is not a de Polignac number, because 11911621 - 2¹ = 11911619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11911592 and 11911601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501 + ... + 4906.

It is an arithmetic number, because the mean of its divisors is an integer number (2979808).

Almost surely, 2^11911621 is an apocalyptic number.

It is an amenable number.

11911621 is a deficient number, since it is larger than the sum of its proper divisors (7611).

11911621 is an equidigital number, since it uses as much as digits as its factorization.

11911621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610.

The product of its digits is 108, while the sum is 22.

The square root of 11911621 is about 3451.3216309118. The cubic root of 11911621 is about 228.3794146905.

The spelling of 11911621 in words is "eleven million, nine hundred eleven thousand, six hundred twenty-one".