11819621 has 4 divisors (see below), whose sum is σ = 12894144. Its totient is φ = 10745100.

The previous prime is 11819611. The next prime is 11819623. The reversal of 11819621 is 12691811.

11819621 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11819621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11819623) 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, 537245 + ... + 537266.

It is an arithmetic number, because the mean of its divisors is an integer number (3223536).

Almost surely, 2^11819621 is an apocalyptic number.

11819621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11819621 is a deficient number, since it is larger than the sum of its proper divisors (1074523).

11819621 is a wasteful number, since it uses less digits than its factorization.

11819621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074522.

The product of its digits is 864, while the sum is 29.

The square root of 11819621 is about 3437.9675682007. The cubic root of 11819621 is about 227.7899278248.

The spelling of 11819621 in words is "eleven million, eight hundred nineteen thousand, six hundred twenty-one".