221001211212101 has 2 divisors, whose sum is σ = 221001211212102. Its totient is φ = 221001211212100.

The previous prime is 221001211212079. The next prime is 221001211212127. The reversal of 221001211212101 is 101212112100122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219105894555076 + 1895316657025 = 14802226^2 + 1376705^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001211212101 - 2³⁴ = 220984031342917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221001211212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221001211212151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500605606050 + 110500605606051.

It is an arithmetic number, because the mean of its divisors is an integer number (110500605606051).

Almost surely, 2^{221001211212101} is an apocalyptic number.

It is an amenable number.

221001211212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001211212101 is an equidigital number, since it uses as much as digits as its factorization.

221001211212101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221001211212101 its reverse (101212112100122), we get a palindrome (322213323312223).

The spelling of 221001211212101 in words is "two hundred twenty-one trillion, one billion, two hundred eleven million, two hundred twelve thousand, one hundred one".