221524243212101 has 2 divisors, whose sum is σ = 221524243212102. Its totient is φ = 221524243212100.

The previous prime is 221524243212091. The next prime is 221524243212227. The reversal of 221524243212101 is 101212342425122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221433030151876 + 91213060225 = 14880626^2 + 302015^2 .

It is a cyclic number.

It is not a de Polignac number, because 221524243212101 - 2²² = 221524239017797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221524243212401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110762121606050 + 110762121606051.

It is an arithmetic number, because the mean of its divisors is an integer number (110762121606051).

Almost surely, 2^{221524243212101} is an apocalyptic number.

It is an amenable number.

221524243212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221524243212101 is an equidigital number, since it uses as much as digits as its factorization.

221524243212101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 221524243212101 its reverse (101212342425122), we get a palindrome (322736585637223).

The spelling of 221524243212101 in words is "two hundred twenty-one trillion, five hundred twenty-four billion, two hundred forty-three million, two hundred twelve thousand, one hundred one".