11511421 has 2 divisors, whose sum is σ = 11511422. Its totient is φ = 11511420.

The previous prime is 11511413. The next prime is 11511427. The reversal of 11511421 is 12411511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 19321 = 3390^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 11511421 - 2³ = 11511413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11511395 and 11511404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11511427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755710 + 5755711.

It is an arithmetic number, because the mean of its divisors is an integer number (5755711).

Almost surely, 2^11511421 is an apocalyptic number.

It is an amenable number.

11511421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511421 is an equidigital number, since it uses as much as digits as its factorization.

11511421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40, while the sum is 16.

The square root of 11511421 is about 3392.8485082597. The cubic root of 11511421 is about 225.7925694803.

Adding to 11511421 its reverse (12411511), we get a palindrome (23922932).

The spelling of 11511421 in words is "eleven million, five hundred eleven thousand, four hundred twenty-one".