20221221201061 has 2 divisors, whose sum is σ = 20221221201062. Its totient is φ = 20221221201060.

The previous prime is 20221221201047. The next prime is 20221221201091. The reversal of 20221221201061 is 16010212212202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19947567712900 + 273653488161 = 4466270^2 + 523119^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221221201061 - 2⁵ = 20221221201029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221221201091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110610600530 + 10110610600531.

It is an arithmetic number, because the mean of its divisors is an integer number (10110610600531).

Almost surely, 2^{20221221201061} is an apocalyptic number.

It is an amenable number.

20221221201061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221221201061 is an equidigital number, since it uses as much as digits as its factorization.

20221221201061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 20221221201061 its reverse (16010212212202), we get a palindrome (36231433413263).

The spelling of 20221221201061 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, sixty-one".