11234444567821 has 2 divisors, whose sum is σ = 11234444567822. Its totient is φ = 11234444567820.

The previous prime is 11234444567761. The next prime is 11234444567839. The reversal of 11234444567821 is 12876544443211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7064639727721 + 4169804840100 = 2657939^2 + 2042010^2 .

It is a cyclic number.

It is not a de Polignac number, because 11234444567821 - 2³⁹ = 10684688753933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11234444564821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5617222283910 + 5617222283911.

It is an arithmetic number, because the mean of its divisors is an integer number (5617222283911).

Almost surely, 2^{11234444567821} is an apocalyptic number.

It is an amenable number.

11234444567821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11234444567821 is an equidigital number, since it uses as much as digits as its factorization.

11234444567821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5160960, while the sum is 52.

The spelling of 11234444567821 in words is "eleven trillion, two hundred thirty-four billion, four hundred forty-four million, five hundred sixty-seven thousand, eight hundred twenty-one".