21110000221021 has 2 divisors, whose sum is σ = 21110000221022. Its totient is φ = 21110000221020.

The previous prime is 21110000221007. The next prime is 21110000221027. The reversal of 21110000221021 is 12012200001112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12637214472996 + 8472785748025 = 3554886^2 + 2910805^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110000221021 - 2²¹ = 21109998123869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110000220992 and 21110000221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110000221027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555000110510 + 10555000110511.

It is an arithmetic number, because the mean of its divisors is an integer number (10555000110511).

Almost surely, 2^{21110000221021} is an apocalyptic number.

It is an amenable number.

21110000221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110000221021 is an equidigital number, since it uses as much as digits as its factorization.

21110000221021 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 13.

Adding to 21110000221021 its reverse (12012200001112), we get a palindrome (33122200222133).

The spelling of 21110000221021 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty-one thousand, twenty-one".