1021000221009 has 12 divisors (see below), whose sum is σ = 1485388013200. Its totient is φ = 675769929624.

The previous prime is 1021000220957. The next prime is 1021000221029. The reversal of 1021000221009 is 9001220001201.

It is not a de Polignac number, because 1021000221009 - 2¹¹ = 1021000218961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021000220982 and 1021000221000.

It is not an unprimeable number, because it can be changed into a prime (1021000221029) 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 in 11 ways as a sum of consecutive naturals, for example, 408072379 + ... + 408074880.

Almost surely, 2^{1021000221009} is an apocalyptic number.

It is an amenable number.

1021000221009 is a deficient number, since it is larger than the sum of its proper divisors (464387792191).

1021000221009 is a wasteful number, since it uses less digits than its factorization.

1021000221009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816147404 (or 816147401 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 1021000221009 in words is "one trillion, twenty-one billion, two hundred twenty-one thousand, nine".