11113421011921 has 2 divisors, whose sum is σ = 11113421011922. Its totient is φ = 11113421011920.

The previous prime is 11113421011919. The next prime is 11113421011933. The reversal of 11113421011921 is 12911012431111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9253088688321 + 1860332323600 = 3041889^2 + 1363940^2 .

It is a cyclic number.

It is not a de Polignac number, because 11113421011921 - 2¹ = 11113421011919 is a prime.

It is a super-2 number, since 2×11113421011921² (a number of 27 digits) contains 22 as substring.

Together with 11113421011919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11113421011921.

It is not a weakly prime, because it can be changed into another prime (11113421011951) 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, 5556710505960 + 5556710505961.

It is an arithmetic number, because the mean of its divisors is an integer number (5556710505961).

Almost surely, 2^{11113421011921} is an apocalyptic number.

It is an amenable number.

11113421011921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11113421011921 is an equidigital number, since it uses as much as digits as its factorization.

11113421011921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 28.

The spelling of 11113421011921 in words is "eleven trillion, one hundred thirteen billion, four hundred twenty-one million, eleven thousand, nine hundred twenty-one".