2215872223781 has 2 divisors, whose sum is σ = 2215872223782. Its totient is φ = 2215872223780.

The previous prime is 2215872223753. The next prime is 2215872223819. The reversal of 2215872223781 is 1873222785122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2074953820900 + 140918402881 = 1440470^2 + 375391^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215872223781 - 2⁶ = 2215872223717 is a prime.

It is a super-2 number, since 2×2215872223781² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215872223751) 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, 1107936111890 + 1107936111891.

It is an arithmetic number, because the mean of its divisors is an integer number (1107936111891).

Almost surely, 2^{2215872223781} is an apocalyptic number.

It is an amenable number.

2215872223781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215872223781 is an equidigital number, since it uses as much as digits as its factorization.

2215872223781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1505280, while the sum is 50.

The spelling of 2215872223781 in words is "two trillion, two hundred fifteen billion, eight hundred seventy-two million, two hundred twenty-three thousand, seven hundred eighty-one".