215220520722191 has 2 divisors, whose sum is σ = 215220520722192. Its totient is φ = 215220520722190.

The previous prime is 215220520722167. The next prime is 215220520722241. The reversal of 215220520722191 is 191227025022512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215220520722191 - 2⁶ = 215220520722127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215220520721191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107610260361095 + 107610260361096.

It is an arithmetic number, because the mean of its divisors is an integer number (107610260361096).

Almost surely, 2^{215220520722191} is an apocalyptic number.

215220520722191 is a deficient number, since it is larger than the sum of its proper divisors (1).

215220520722191 is an equidigital number, since it uses as much as digits as its factorization.

215220520722191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 215220520722191 in words is "two hundred fifteen trillion, two hundred twenty billion, five hundred twenty million, seven hundred twenty-two thousand, one hundred ninety-one".