221040101 has 2 divisors, whose sum is σ = 221040102. Its totient is φ = 221040100.

The previous prime is 221040089. The next prime is 221040121. The reversal of 221040101 is 101040122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 27552001 = 13910^2 + 5249^2 .

It is a cyclic number.

It is not a de Polignac number, because 221040101 - 2⁶ = 221040037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221040121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110520050 + 110520051.

It is an arithmetic number, because the mean of its divisors is an integer number (110520051).

Almost surely, 2^221040101 is an apocalyptic number.

It is an amenable number.

221040101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221040101 is an equidigital number, since it uses as much as digits as its factorization.

221040101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221040101 is about 14867.4174287265. The cubic root of 221040101 is about 604.6309257734.

Adding to 221040101 its reverse (101040122), we get a palindrome (322080223).

The spelling of 221040101 in words is "two hundred twenty-one million, forty thousand, one hundred one".