1021012221709 has 2 divisors, whose sum is σ = 1021012221710. Its totient is φ = 1021012221708.

The previous prime is 1021012221617. The next prime is 1021012221791. The reversal of 1021012221709 is 9071222101201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980793122500 + 40219099209 = 990350^2 + 200547^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021012221709 - 2⁹ = 1021012221197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021012222709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510506110854 + 510506110855.

It is an arithmetic number, because the mean of its divisors is an integer number (510506110855).

Almost surely, 2^{1021012221709} is an apocalyptic number.

It is an amenable number.

1021012221709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021012221709 is an equidigital number, since it uses as much as digits as its factorization.

1021012221709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 1021012221709 in words is "one trillion, twenty-one billion, twelve million, two hundred twenty-one thousand, seven hundred nine".