21000221100941 has 2 divisors, whose sum is σ = 21000221100942. Its totient is φ = 21000221100940.

The previous prime is 21000221100931. The next prime is 21000221101009. The reversal of 21000221100941 is 14900112200012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20484187194916 + 516033906025 = 4525946^2 + 718355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000221100941 is a prime.

It is a super-2 number, since 2×21000221100941² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000221100931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500110550470 + 10500110550471.

It is an arithmetic number, because the mean of its divisors is an integer number (10500110550471).

Almost surely, 2^{21000221100941} is an apocalyptic number.

It is an amenable number.

21000221100941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000221100941 is an equidigital number, since it uses as much as digits as its factorization.

21000221100941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 21000221100941 its reverse (14900112200012), we get a palindrome (35900333300953).

The spelling of 21000221100941 in words is "twenty-one trillion, two hundred twenty-one million, one hundred thousand, nine hundred forty-one".