20102111009 has 8 divisors (see below), whose sum is σ = 20192659080. Its totient is φ = 20011622400.

The previous prime is 20102110961. The next prime is 20102111039. The reversal of 20102111009 is 90011120102.

It can be written as a sum of positive squares in 4 ways, for example, as 13711707409 + 6390403600 = 117097^2 + 79940^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20102111009 - 2⁸ = 20102110753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102111039) 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 7 ways as a sum of consecutive naturals, for example, 750569 + ... + 776889.

It is an arithmetic number, because the mean of its divisors is an integer number (2524082385).

Almost surely, 2^20102111009 is an apocalyptic number.

It is an amenable number.

20102111009 is a deficient number, since it is larger than the sum of its proper divisors (90548071).

20102111009 is a wasteful number, since it uses less digits than its factorization.

20102111009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29731.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20102111009 in words is "twenty billion, one hundred two million, one hundred eleven thousand, nine".