11451222421 has 2 divisors, whose sum is σ = 11451222422. Its totient is φ = 11451222420.

The previous prime is 11451222413. The next prime is 11451222437. The reversal of 11451222421 is 12422215411.

11451222421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9368304100 + 2082918321 = 96790^2 + 45639^2 .

It is a cyclic number.

It is not a de Polignac number, because 11451222421 - 2³ = 11451222413 is a prime.

It is a super-2 number, since 2×11451222421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11451222481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5725611210 + 5725611211.

It is an arithmetic number, because the mean of its divisors is an integer number (5725611211).

Almost surely, 2^11451222421 is an apocalyptic number.

It is an amenable number.

11451222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11451222421 is an equidigital number, since it uses as much as digits as its factorization.

11451222421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280, while the sum is 25.

Adding to 11451222421 its reverse (12422215411), we get a palindrome (23873437832).

The spelling of 11451222421 in words is "eleven billion, four hundred fifty-one million, two hundred twenty-two thousand, four hundred twenty-one".