221225940180901 has 2 divisors, whose sum is σ = 221225940180902. Its totient is φ = 221225940180900.

The previous prime is 221225940180851. The next prime is 221225940180929. The reversal of 221225940180901 is 109081049522122.

221225940180901 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., 219855052800100 + 1370887380801 = 14827510^2 + 1170849^2 .

It is a cyclic number.

It is not a de Polignac number, because 221225940180901 - 2¹⁹ = 221225939656613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221225940184901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110612970090450 + 110612970090451.

It is an arithmetic number, because the mean of its divisors is an integer number (110612970090451).

Almost surely, 2^{221225940180901} is an apocalyptic number.

It is an amenable number.

221225940180901 is a deficient number, since it is larger than the sum of its proper divisors (1).

221225940180901 is an equidigital number, since it uses as much as digits as its factorization.

221225940180901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 221225940180901 in words is "two hundred twenty-one trillion, two hundred twenty-five billion, nine hundred forty million, one hundred eighty thousand, nine hundred one".