1021000122009 has 24 divisors (see below), whose sum is σ = 1685827640640. Its totient is φ = 583301560608.

The previous prime is 1021000122001. The next prime is 1021000122031. The reversal of 1021000122009 is 9002210001201.

It is not a de Polignac number, because 1021000122009 - 2³ = 1021000122001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021000121982 and 1021000122000.

It is not an unprimeable number, because it can be changed into a prime (1021000122001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1473099 + ... + 2052320.

It is an arithmetic number, because the mean of its divisors is an integer number (70242818360).

Almost surely, 2^{1021000122009} is an apocalyptic number.

It is an amenable number.

1021000122009 is a deficient number, since it is larger than the sum of its proper divisors (664827518631).

1021000122009 is a wasteful number, since it uses less digits than its factorization.

1021000122009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530029 (or 3530026 counting only the distinct ones).

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

The spelling of 1021000122009 in words is "one trillion, twenty-one billion, one hundred twenty-two thousand, nine".