100021020009 has 16 divisors (see below), whose sum is σ = 141085824000. Its totient is φ = 62853720336.

The previous prime is 100021019963. The next prime is 100021020013. The reversal of 100021020009 is 900020120001.

It is a happy number.

It is not a de Polignac number, because 100021020009 - 2³¹ = 97873536361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100021020009.

It is not an unprimeable number, because it can be changed into a prime (100021020109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4397589 + ... + 4420274.

It is an arithmetic number, because the mean of its divisors is an integer number (8817864000).

Almost surely, 2^100021020009 is an apocalyptic number.

100021020009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

100021020009 is a deficient number, since it is larger than the sum of its proper divisors (41064803991).

100021020009 is a wasteful number, since it uses less digits than its factorization.

100021020009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8818084.

The product of its (nonzero) digits is 36, while the sum is 15.

The spelling of 100021020009 in words is "one hundred billion, twenty-one million, twenty thousand, nine".