221210100101 has 2 divisors, whose sum is σ = 221210100102. Its totient is φ = 221210100100.

The previous prime is 221210100079. The next prime is 221210100103. The reversal of 221210100101 is 101001012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183847143076 + 37362957025 = 428774^2 + 193295^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210100101 - 2⁶ = 221210100037 is a prime.

Together with 221210100103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221210100103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605050050 + 110605050051.

It is an arithmetic number, because the mean of its divisors is an integer number (110605050051).

Almost surely, 2^221210100101 is an apocalyptic number.

It is an amenable number.

221210100101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210100101 is an equidigital number, since it uses as much as digits as its factorization.

221210100101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221210100101 its reverse (101001012122), we get a palindrome (322211112223).

The spelling of 221210100101 in words is "two hundred twenty-one billion, two hundred ten million, one hundred thousand, one hundred one".