2215880324221 has 2 divisors, whose sum is σ = 2215880324222. Its totient is φ = 2215880324220.

The previous prime is 2215880324143. The next prime is 2215880324257. The reversal of 2215880324221 is 1224230885122.

2215880324221 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., 1972308463321 + 243571860900 = 1404389^2 + 493530^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215880324221 - 2¹⁵ = 2215880291453 is a prime.

It is a super-2 number, since 2×2215880324221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215880324261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107940162110 + 1107940162111.

It is an arithmetic number, because the mean of its divisors is an integer number (1107940162111).

Almost surely, 2^{2215880324221} is an apocalyptic number.

It is an amenable number.

2215880324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215880324221 is an equidigital number, since it uses as much as digits as its factorization.

2215880324221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 2215880324221 in words is "two trillion, two hundred fifteen billion, eight hundred eighty million, three hundred twenty-four thousand, two hundred twenty-one".