11031821 has 2 divisors, whose sum is σ = 11031822. Its totient is φ = 11031820.

The previous prime is 11031763. The next prime is 11031847. The reversal of 11031821 is 12813011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8094025 + 2937796 = 2845^2 + 1714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11031821 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11031821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11031871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5515910 + 5515911.

It is an arithmetic number, because the mean of its divisors is an integer number (5515911).

Almost surely, 2^11031821 is an apocalyptic number.

It is an amenable number.

11031821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11031821 is an equidigital number, since it uses as much as digits as its factorization.

11031821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 11031821 is about 3321.4185222582. The cubic root of 11031821 is about 222.6122549328.

Adding to 11031821 its reverse (12813011), we get a palindrome (23844832).

The spelling of 11031821 in words is "eleven million, thirty-one thousand, eight hundred twenty-one".