11801063821 has 2 divisors, whose sum is σ = 11801063822. Its totient is φ = 11801063820.

The previous prime is 11801063819. The next prime is 11801063881. The reversal of 11801063821 is 12836010811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10172941321 + 1628122500 = 100861^2 + 40350^2 .

It is a cyclic number.

It is not a de Polignac number, because 11801063821 - 2¹ = 11801063819 is a prime.

Together with 11801063819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11801063881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5900531910 + 5900531911.

It is an arithmetic number, because the mean of its divisors is an integer number (5900531911).

Almost surely, 2^11801063821 is an apocalyptic number.

It is an amenable number.

11801063821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11801063821 is an equidigital number, since it uses as much as digits as its factorization.

11801063821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 11801063821 in words is "eleven billion, eight hundred one million, sixty-three thousand, eight hundred twenty-one".