1021220000321 has 2 divisors, whose sum is σ = 1021220000322. Its totient is φ = 1021220000320.

The previous prime is 1021220000309. The next prime is 1021220000399. The reversal of 1021220000321 is 1230000221201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 932120735296 + 89099265025 = 965464^2 + 298495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021220000321 - 2¹⁸ = 1021219738177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021220000296 and 1021220000305.

It is not a weakly prime, because it can be changed into another prime (1021220005321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610000160 + 510610000161.

It is an arithmetic number, because the mean of its divisors is an integer number (510610000161).

Almost surely, 2^{1021220000321} is an apocalyptic number.

It is an amenable number.

1021220000321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021220000321 is an equidigital number, since it uses as much as digits as its factorization.

1021220000321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1021220000321 its reverse (1230000221201), we get a palindrome (2251220221522).

The spelling of 1021220000321 in words is "one trillion, twenty-one billion, two hundred twenty million, three hundred twenty-one", and thus it is an aban number.