21002101110108 has 18 divisors (see below), whose sum is σ = 53088644472864. Its totient is φ = 7000700370024.

The previous prime is 21002101110101. The next prime is 21002101110113. The reversal of 21002101110108 is 80101110120012.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002101110101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291695848716 + ... + 291695848787.

Almost surely, 2^{21002101110108} is an apocalyptic number.

It is an amenable number.

21002101110108 is an abundant number, since it is smaller than the sum of its proper divisors (32086543362756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002101110108 is a wasteful number, since it uses less digits than its factorization.

21002101110108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583391697513 (or 583391697508 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

The spelling of 21002101110108 in words is "twenty-one trillion, two billion, one hundred one million, one hundred ten thousand, one hundred eight".