11123621 has 2 divisors, whose sum is σ = 11123622. Its totient is φ = 11123620.

The previous prime is 11123599. The next prime is 11123633. The reversal of 11123621 is 12632111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 1600225 = 3086^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123621 - 2⁶ = 11123557 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 11123621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11123221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561810 + 5561811.

It is an arithmetic number, because the mean of its divisors is an integer number (5561811).

Almost surely, 2^11123621 is an apocalyptic number.

It is an amenable number.

11123621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123621 is an equidigital number, since it uses as much as digits as its factorization.

11123621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 11123621 is about 3335.2092887853. The cubic root of 11123621 is about 223.2280306026.

Adding to 11123621 its reverse (12632111), we get a palindrome (23755732).

It can be divided in two parts, 111 and 23621, that added together give a palindrome (23732).

The spelling of 11123621 in words is "eleven million, one hundred twenty-three thousand, six hundred twenty-one".