2102121010105 has 32 divisors (see below), whose sum is σ = 2681399977344. Its totient is φ = 1576573510656.

The previous prime is 2102121010091. The next prime is 2102121010159. The reversal of 2102121010105 is 5010101212012.

It is a cyclic number.

It is not a de Polignac number, because 2102121010105 - 2¹³ = 2102121001913 is a prime.

It is a super-2 number, since 2×2102121010105² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68228634 + ... + 68259436.

It is an arithmetic number, because the mean of its divisors is an integer number (83793749292).

Almost surely, 2^{2102121010105} is an apocalyptic number.

It is an amenable number.

2102121010105 is a deficient number, since it is larger than the sum of its proper divisors (579278967239).

2102121010105 is a wasteful number, since it uses less digits than its factorization.

2102121010105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33945.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 2102121010105 its reverse (5010101212012), we get a palindrome (7112222222117).

The spelling of 2102121010105 in words is "two trillion, one hundred two billion, one hundred twenty-one million, ten thousand, one hundred five".