21102121101212 has 48 divisors (see below), whose sum is σ = 37465043882112. Its totient is φ = 10398931092480.

The previous prime is 21102121101209. The next prime is 21102121101223. The reversal of 21102121101212 is 21210112120112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165647213 + ... + 165774555.

It is an arithmetic number, because the mean of its divisors is an integer number (780521747544).

Almost surely, 2^{21102121101212} is an apocalyptic number.

It is an amenable number.

21102121101212 is a deficient number, since it is larger than the sum of its proper divisors (16362922780900).

21102121101212 is a wasteful number, since it uses less digits than its factorization.

21102121101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129518 (or 129516 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21102121101212 its reverse (21210112120112), we get a palindrome (42312233221324).

The spelling of 21102121101212 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, one hundred one thousand, two hundred twelve".