11251421 has 2 divisors, whose sum is σ = 11251422. Its totient is φ = 11251420.

The previous prime is 11251381. The next prime is 11251447. The reversal of 11251421 is 12415211.

11251421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 940900 = 3211^2 + 970^2 .

It is an emirp because it is prime and its reverse (12415211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11251421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11251421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11251451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5625710 + 5625711.

It is an arithmetic number, because the mean of its divisors is an integer number (5625711).

Almost surely, 2^11251421 is an apocalyptic number.

It is an amenable number.

11251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11251421 is an equidigital number, since it uses as much as digits as its factorization.

11251421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 17.

The square root of 11251421 is about 3354.3137897340. The cubic root of 11251421 is about 224.0796711176.

Adding to 11251421 its reverse (12415211), we get a palindrome (23666632).

The spelling of 11251421 in words is "eleven million, two hundred fifty-one thousand, four hundred twenty-one".