20101101209 has 8 divisors (see below), whose sum is σ = 23764848960. Its totient is φ = 16635393936.

The previous prime is 20101101203. The next prime is 20101101211. The reversal of 20101101209 is 90210110102.

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

It is not a de Polignac number, because 20101101209 - 2¹² = 20101097113 is a prime.

It is a super-2 number, since 2×20101101209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101101203) 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, 49509899 + ... + 49510304.

It is an arithmetic number, because the mean of its divisors is an integer number (2970606120).

Almost surely, 2^20101101209 is an apocalyptic number.

20101101209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20101101209 is a deficient number, since it is larger than the sum of its proper divisors (3663747751).

20101101209 is an equidigital number, since it uses as much as digits as its factorization.

20101101209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99020239.

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

The spelling of 20101101209 in words is "twenty billion, one hundred one million, one hundred one thousand, two hundred nine".