20041041221 has 2 divisors, whose sum is σ = 20041041222. Its totient is φ = 20041041220.

The previous prime is 20041041197. The next prime is 20041041227. The reversal of 20041041221 is 12214014002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13742872900 + 6298168321 = 117230^2 + 79361^2 .

It is a cyclic number.

It is not a de Polignac number, because 20041041221 - 2¹⁰ = 20041040197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20041041221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20041041227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020520610 + 10020520611.

It is an arithmetic number, because the mean of its divisors is an integer number (10020520611).

Almost surely, 2^20041041221 is an apocalyptic number.

It is an amenable number.

20041041221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041041221 is an equidigital number, since it uses as much as digits as its factorization.

20041041221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20041041221 its reverse (12214014002), we get a palindrome (32255055223).

The spelling of 20041041221 in words is "twenty billion, forty-one million, forty-one thousand, two hundred twenty-one".