21012201022012 has 48 divisors (see below), whose sum is σ = 38974206557440. Its totient is φ = 9884451140352.

The previous prime is 21012201021967. The next prime is 21012201022013. The reversal of 21012201022012 is 21022010221012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012201022013) by changing a digit.

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, 15413353 + ... + 16721119.

Almost surely, 2^{21012201022012} is an apocalyptic number.

It is an amenable number.

21012201022012 is a deficient number, since it is larger than the sum of its proper divisors (17962005535428).

21012201022012 is a wasteful number, since it uses less digits than its factorization.

21012201022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309250 (or 1309248 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012201022012 its reverse (21022010221012), we get a palindrome (42034211243024).

The spelling of 21012201022012 in words is "twenty-one trillion, twelve billion, two hundred one million, twenty-two thousand, twelve".