1021220221061 has 2 divisors, whose sum is σ = 1021220221062. Its totient is φ = 1021220221060.

The previous prime is 1021220221051. The next prime is 1021220221103. The reversal of 1021220221061 is 1601220221201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839770632100 + 181449588961 = 916390^2 + 425969^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021220221061 - 2¹⁰ = 1021220220037 is a prime.

It is a super-4 number, since 4×1021220221061⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021220221051) 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, 510610110530 + 510610110531.

It is an arithmetic number, because the mean of its divisors is an integer number (510610110531).

Almost surely, 2^{1021220221061} is an apocalyptic number.

It is an amenable number.

1021220221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021220221061 is an equidigital number, since it uses as much as digits as its factorization.

1021220221061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1021220221061 its reverse (1601220221201), we get a palindrome (2622440442262).

The spelling of 1021220221061 in words is "one trillion, twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, sixty-one".