100121101212 has 96 divisors (see below), whose sum is σ = 261102320640. Its totient is φ = 29599947520.

The previous prime is 100121101189. The next prime is 100121101253. The reversal of 100121101212 is 212101121001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 1941214 + ... + 1992122.

It is an arithmetic number, because the mean of its divisors is an integer number (2719815840).

Almost surely, 2^100121101212 is an apocalyptic number.

100121101212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100121101212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130551160320).

100121101212 is an abundant number, since it is smaller than the sum of its proper divisors (160981219428).

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

100121101212 is a wasteful number, since it uses less digits than its factorization.

100121101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51291 (or 51289 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 100121101212 its reverse (212101121001), we get a palindrome (312222222213).

The spelling of 100121101212 in words is "one hundred billion, one hundred twenty-one million, one hundred one thousand, two hundred twelve".