11421881 has 4 divisors (see below), whose sum is σ = 11433972. Its totient is φ = 11409792.

The previous prime is 11421877. The next prime is 11421887. The reversal of 11421881 is 18812411.

11421881 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.

It can be written as a sum of positive squares in 2 ways, for example, as 7182400 + 4239481 = 2680^2 + 2059^2 .

It is a cyclic number.

It is not a de Polignac number, because 11421881 - 2² = 11421877 is a prime.

It is a super-2 number, since 2×11421881² = 260918731156322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11421881.

It is not an unprimeable number, because it can be changed into a prime (11421887) 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, 4496 + ... + 6561.

It is an arithmetic number, because the mean of its divisors is an integer number (2858493).

Almost surely, 2^11421881 is an apocalyptic number.

It is an amenable number.

11421881 is a deficient number, since it is larger than the sum of its proper divisors (12091).

11421881 is a wasteful number, since it uses less digits than its factorization.

11421881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12090.

The product of its digits is 512, while the sum is 26.

The square root of 11421881 is about 3379.6273463209. The cubic root of 11421881 is about 225.2056128696.

The spelling of 11421881 in words is "eleven million, four hundred twenty-one thousand, eight hundred eighty-one".