21001212102012 has 24 divisors (see below), whose sum is σ = 49002903519696. Its totient is φ = 7000393279488.

The previous prime is 21001212101983. The next prime is 21001212102067. The reversal of 21001212102012 is 21020121210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001212101982 and 21001212102000.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12473148 + ... + 14056380.

It is an arithmetic number, because the mean of its divisors is an integer number (2041787646654).

Almost surely, 2^{21001212102012} is an apocalyptic number.

It is an amenable number.

21001212102012 is an abundant number, since it is smaller than the sum of its proper divisors (28001691417684).

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

21001212102012 is a wasteful number, since it uses less digits than its factorization.

21001212102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688637 (or 2688635 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001212102012 its reverse (21020121210012), we get a palindrome (42021333312024).

The spelling of 21001212102012 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred two thousand, twelve".