11379905821 has 2 divisors, whose sum is σ = 11379905822. Its totient is φ = 11379905820.

The previous prime is 11379905737. The next prime is 11379905857. The reversal of 11379905821 is 12850997311.

11379905821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10980105796 + 399800025 = 104786^2 + 19995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11379905821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11379905861) 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, 5689952910 + 5689952911.

It is an arithmetic number, because the mean of its divisors is an integer number (5689952911).

Almost surely, 2^11379905821 is an apocalyptic number.

It is an amenable number.

11379905821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11379905821 is an equidigital number, since it uses as much as digits as its factorization.

11379905821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 11379905821 in words is "eleven billion, three hundred seventy-nine million, nine hundred five thousand, eight hundred twenty-one".