21100121212112 has 10 divisors (see below), whose sum is σ = 40881484848498. Its totient is φ = 10550060606048.

The previous prime is 21100121212057. The next prime is 21100121212139. The reversal of 21100121212112 is 21121212100112.

It can be written as a sum of positive squares in only one way, i.e., 21044385557056 + 55735655056 = 4587416^2 + 236084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659378787863 + ... + 659378787894.

Almost surely, 2^{21100121212112} is an apocalyptic number.

It is an amenable number.

21100121212112 is a deficient number, since it is larger than the sum of its proper divisors (19781363636386).

21100121212112 is a wasteful number, since it uses less digits than its factorization.

21100121212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318757575765 (or 1318757575759 counting only the distinct ones).

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

Adding to 21100121212112 its reverse (21121212100112), we get a palindrome (42221333312224).

The spelling of 21100121212112 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twelve".