21112100121108 has 96 divisors (see below), whose sum is σ = 51460428015360. Its totient is φ = 6728021314560.

The previous prime is 21112100121017. The next prime is 21112100121109. The reversal of 21112100121108 is 80112100121112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112100121109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 418525168 + ... + 418575608.

It is an arithmetic number, because the mean of its divisors is an integer number (536046125160).

Almost surely, 2^{21112100121108} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112100121108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25730214007680).

21112100121108 is an abundant number, since it is smaller than the sum of its proper divisors (30348327894252).

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

21112100121108 is a wasteful number, since it uses less digits than its factorization.

21112100121108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62257 (or 62255 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 21.

The spelling of 21112100121108 in words is "twenty-one trillion, one hundred twelve billion, one hundred million, one hundred twenty-one thousand, one hundred eight".