21000002212012 has 48 divisors (see below), whose sum is σ = 37811505231360. Its totient is φ = 10201870210752.

The previous prime is 21000002212003. The next prime is 21000002212031. The reversal of 21000002212012 is 21021220000012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21000002211983 and 21000002212001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4967853 + ... + 8165755.

It is an arithmetic number, because the mean of its divisors is an integer number (787739692320).

Almost surely, 2^{21000002212012} is an apocalyptic number.

It is an amenable number.

21000002212012 is a deficient number, since it is larger than the sum of its proper divisors (16811503019348).

21000002212012 is a wasteful number, since it uses less digits than its factorization.

21000002212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198310 (or 3198308 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000002212012 its reverse (21021220000012), we get a palindrome (42021222212024).

The spelling of 21000002212012 in words is "twenty-one trillion, two million, two hundred twelve thousand, twelve".