11281021 has 4 divisors (see below), whose sum is σ = 11288032. Its totient is φ = 11274012.

The previous prime is 11281019. The next prime is 11281031. The reversal of 11281021 is 12018211.

11281021 is digitally balanced in base 2 and base 3, because in such bases 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.

It is a cyclic number.

It is not a de Polignac number, because 11281021 - 2¹ = 11281019 is a prime.

It is a super-2 number, since 2×11281021² = 254522869604882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11280986 and 11281004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11281001) 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, 250 + ... + 4756.

It is an arithmetic number, because the mean of its divisors is an integer number (2822008).

Almost surely, 2^11281021 is an apocalyptic number.

It is an amenable number.

11281021 is a deficient number, since it is larger than the sum of its proper divisors (7011).

11281021 is an equidigital number, since it uses as much as digits as its factorization.

11281021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 11281021 is about 3358.7231204730. The cubic root of 11281021 is about 224.2760004023.

Adding to 11281021 its reverse (12018211), we get a palindrome (23299232).

The spelling of 11281021 in words is "eleven million, two hundred eighty-one thousand, twenty-one".