21027304022161 has 2 divisors, whose sum is σ = 21027304022162. Its totient is φ = 21027304022160.

The previous prime is 21027304022099. The next prime is 21027304022201. The reversal of 21027304022161 is 16122040372012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20613134548561 + 414169473600 = 4540169^2 + 643560^2 .

It is a cyclic number.

It is not a de Polignac number, because 21027304022161 - 2²⁵ = 21027270467729 is a prime.

It is not a weakly prime, because it can be changed into another prime (21027304023161) 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, 10513652011080 + 10513652011081.

It is an arithmetic number, because the mean of its divisors is an integer number (10513652011081).

Almost surely, 2^{21027304022161} is an apocalyptic number.

It is an amenable number.

21027304022161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21027304022161 is an equidigital number, since it uses as much as digits as its factorization.

21027304022161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 21027304022161 its reverse (16122040372012), we get a palindrome (37149344394173).

The spelling of 21027304022161 in words is "twenty-one trillion, twenty-seven billion, three hundred four million, twenty-two thousand, one hundred sixty-one".