11311021 has 4 divisors (see below), whose sum is σ = 11574112. Its totient is φ = 11047932.

The previous prime is 11311019. The next prime is 11311031. The reversal of 11311021 is 12011311.

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: 12011311 = 13 ⋅923947.

It is a cyclic number.

It is not a de Polignac number, because 11311021 - 2¹ = 11311019 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11310989 and 11311007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311031) 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, 131481 + ... + 131566.

It is an arithmetic number, because the mean of its divisors is an integer number (2893528).

Almost surely, 2^11311021 is an apocalyptic number.

It is an amenable number.

11311021 is a deficient number, since it is larger than the sum of its proper divisors (263091).

11311021 is an equidigital number, since it uses as much as digits as its factorization.

11311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263090.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 11311021 is about 3363.1861381731. The cubic root of 11311021 is about 224.4746326762.

Adding to 11311021 its reverse (12011311), we get a palindrome (23322332).

The spelling of 11311021 in words is "eleven million, three hundred eleven thousand, twenty-one".