221525161320427 has 2 divisors, whose sum is σ = 221525161320428. Its totient is φ = 221525161320426.

The previous prime is 221525161320367. The next prime is 221525161320431. The reversal of 221525161320427 is 724023161525122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221525161320427 - 2³⁵ = 221490801582059 is a prime.

It is not a weakly prime, because it can be changed into another prime (221505161320427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110762580660213 + 110762580660214.

It is an arithmetic number, because the mean of its divisors is an integer number (110762580660214).

Almost surely, 2^{221525161320427} is an apocalyptic number.

221525161320427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221525161320427 is an equidigital number, since it uses as much as digits as its factorization.

221525161320427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 221525161320427 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, one hundred sixty-one million, three hundred twenty thousand, four hundred twenty-seven".