221021112120101 has 2 divisors, whose sum is σ = 221021112120102. Its totient is φ = 221021112120100.

The previous prime is 221021112120047. The next prime is 221021112120163. The reversal of 221021112120101 is 101021211120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214362570547876 + 6658541572225 = 14641126^2 + 2580415^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021112120101 - 2¹⁰ = 221021112119077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221021112120101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021112120181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510556060050 + 110510556060051.

It is an arithmetic number, because the mean of its divisors is an integer number (110510556060051).

Almost surely, 2^{221021112120101} is an apocalyptic number.

It is an amenable number.

221021112120101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021112120101 is an equidigital number, since it uses as much as digits as its factorization.

221021112120101 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 221021112120101 its reverse (101021211120122), we get a palindrome (322042323240223).

The spelling of 221021112120101 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred twenty thousand, one hundred one".