11225821 has 4 divisors (see below), whose sum is σ = 11368000. Its totient is φ = 11083644.

The previous prime is 11225803. The next prime is 11225839. The reversal of 11225821 is 12852211.

11225821 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 12852211 = 457 ⋅28123.

It is an interprime number because it is at equal distance from previous prime (11225803) and next prime (11225839).

It is a cyclic number.

It is not a de Polignac number, because 11225821 - 2⁷ = 11225693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11225792 and 11225801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220821) 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, 70971 + ... + 71128.

It is an arithmetic number, because the mean of its divisors is an integer number (2842000).

Almost surely, 2^11225821 is an apocalyptic number.

It is an amenable number.

11225821 is a deficient number, since it is larger than the sum of its proper divisors (142179).

11225821 is an equidigital number, since it uses as much as digits as its factorization.

11225821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142178.

The product of its digits is 320, while the sum is 22.

The square root of 11225821 is about 3350.4956349770. The cubic root of 11225821 is about 223.9095949487.

The spelling of 11225821 in words is "eleven million, two hundred twenty-five thousand, eight hundred twenty-one".