11456542021 has 2 divisors, whose sum is σ = 11456542022. Its totient is φ = 11456542020.

The previous prime is 11456541991. The next prime is 11456542067. The reversal of 11456542021 is 12024565411.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9450756225 + 2005785796 = 97215^2 + 44786^2 .

It is a cyclic number.

It is not a de Polignac number, because 11456542021 - 2¹¹ = 11456539973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11456542421) 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, 5728271010 + 5728271011.

It is an arithmetic number, because the mean of its divisors is an integer number (5728271011).

Almost surely, 2^11456542021 is an apocalyptic number.

It is an amenable number.

11456542021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11456542021 is an equidigital number, since it uses as much as digits as its factorization.

11456542021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 11456542021 in words is "eleven billion, four hundred fifty-six million, five hundred forty-two thousand, twenty-one".