21112100121012 has 96 divisors (see below), whose sum is σ = 50542935206400. Its totient is φ = 6855722852352.

The previous prime is 21112100120981. The next prime is 21112100121017. The reversal of 21112100121012 is 21012100121112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112100120982 and 21112100121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112100121017) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 405905664 + ... + 405957672.

It is an arithmetic number, because the mean of its divisors is an integer number (526488908400).

Almost surely, 2^{21112100121012} is an apocalyptic number.

It is an amenable number.

21112100121012 is an abundant number, since it is smaller than the sum of its proper divisors (29430835085388).

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

21112100121012 is a wasteful number, since it uses less digits than its factorization.

21112100121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55385 (or 55383 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112100121012 its reverse (21012100121112), we get a palindrome (42124200242124).

The spelling of 21112100121012 in words is "twenty-one trillion, one hundred twelve billion, one hundred million, one hundred twenty-one thousand, twelve".