11451123605921 has 2 divisors, whose sum is σ = 11451123605922. Its totient is φ = 11451123605920.

The previous prime is 11451123605879. The next prime is 11451123606007. The reversal of 11451123605921 is 12950632115411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8862529000000 + 2588594605921 = 2977000^2 + 1608911^2 .

It is a cyclic number.

It is not a de Polignac number, because 11451123605921 - 2³⁴ = 11433943736737 is a prime.

It is a super-2 number, since 2×11451123605921² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11451123605821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5725561802960 + 5725561802961.

It is an arithmetic number, because the mean of its divisors is an integer number (5725561802961).

Almost surely, 2^{11451123605921} is an apocalyptic number.

It is an amenable number.

11451123605921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11451123605921 is an equidigital number, since it uses as much as digits as its factorization.

11451123605921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 11451123605921 in words is "eleven trillion, four hundred fifty-one billion, one hundred twenty-three million, six hundred five thousand, nine hundred twenty-one".