1021000220489 has 2 divisors, whose sum is σ = 1021000220490. Its totient is φ = 1021000220488.

The previous prime is 1021000220479. The next prime is 1021000220501. The reversal of 1021000220489 is 9840220001201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 943112899600 + 77887320889 = 971140^2 + 279083^2 .

It is an emirp because it is prime and its reverse (9840220001201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021000220489 - 2¹⁶ = 1021000154953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021000220479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510500110244 + 510500110245.

It is an arithmetic number, because the mean of its divisors is an integer number (510500110245).

Almost surely, 2^{1021000220489} is an apocalyptic number.

It is an amenable number.

1021000220489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021000220489 is an equidigital number, since it uses as much as digits as its factorization.

1021000220489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 1021000220489 in words is "one trillion, twenty-one billion, two hundred twenty thousand, four hundred eighty-nine".