21002212112012 has 48 divisors (see below), whose sum is σ = 38855758233600. Its totient is φ = 9912684999360.

The previous prime is 21002212111987. The next prime is 21002212112029. The reversal of 21002212112012 is 21021121220012.

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 15 ways as a sum of consecutive naturals, for example, 14658314 + ... + 16027182.

It is an arithmetic number, because the mean of its divisors is an integer number (809494963200).

Almost surely, 2^{21002212112012} is an apocalyptic number.

It is an amenable number.

21002212112012 is a deficient number, since it is larger than the sum of its proper divisors (17853546121588).

21002212112012 is a wasteful number, since it uses less digits than its factorization.

21002212112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371086 (or 1371084 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21002212112012 its reverse (21021121220012), we get a palindrome (42023333332024).

The spelling of 21002212112012 in words is "twenty-one trillion, two billion, two hundred twelve million, one hundred twelve thousand, twelve".