221525701132591 has 2 divisors, whose sum is σ = 221525701132592. Its totient is φ = 221525701132590.

The previous prime is 221525701132529. The next prime is 221525701132661. The reversal of 221525701132591 is 195231107525122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221525701132591 - 2⁹ = 221525701132079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221525701132501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110762850566295 + 110762850566296.

It is an arithmetic number, because the mean of its divisors is an integer number (110762850566296).

Almost surely, 2^{221525701132591} is an apocalyptic number.

221525701132591 is a deficient number, since it is larger than the sum of its proper divisors (1).

221525701132591 is an equidigital number, since it uses as much as digits as its factorization.

221525701132591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 221525701132591 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, seven hundred one million, one hundred thirty-two thousand, five hundred ninety-one".