21102120011 has 8 divisors (see below), whose sum is σ = 24677562624. Its totient is φ = 17666890920.

The previous prime is 21102119993. The next prime is 21102120041. The reversal of 21102120011 is 11002120112.

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

It is not a de Polignac number, because 21102120011 - 2¹⁰ = 21102118987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102119974 and 21102120001.

It is not an unprimeable number, because it can be changed into a prime (21102120041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35053055 + ... + 35053656.

It is an arithmetic number, because the mean of its divisors is an integer number (3084695328).

Almost surely, 2^21102120011 is an apocalyptic number.

21102120011 is a deficient number, since it is larger than the sum of its proper divisors (3575442613).

21102120011 is an equidigital number, since it uses as much as digits as its factorization.

21102120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70106761.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102120011 its reverse (11002120112), we get a palindrome (32104240123).

The spelling of 21102120011 in words is "twenty-one billion, one hundred two million, one hundred twenty thousand, eleven".