221012220101 has 2 divisors, whose sum is σ = 221012220102. Its totient is φ = 221012220100.

The previous prime is 221012220097. The next prime is 221012220119. The reversal of 221012220101 is 101022210122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175057723201 + 45954496900 = 418399^2 + 214370^2 .

It is a cyclic number.

It is not a de Polignac number, because 221012220101 - 2² = 221012220097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221012220181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506110050 + 110506110051.

It is an arithmetic number, because the mean of its divisors is an integer number (110506110051).

Almost surely, 2^221012220101 is an apocalyptic number.

It is an amenable number.

221012220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012220101 is an equidigital number, since it uses as much as digits as its factorization.

221012220101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221012220101 its reverse (101022210122), we get a palindrome (322034430223).

The spelling of 221012220101 in words is "two hundred twenty-one billion, twelve million, two hundred twenty thousand, one hundred one".