21021020222012 has 24 divisors (see below), whose sum is σ = 38134116531504. Its totient is φ = 10130868035712.

The previous prime is 21021020222009. The next prime is 21021020222023. The reversal of 21021020222012 is 21022202012012.

It is a happy number.

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, 663694073 + ... + 663725744.

It is an arithmetic number, because the mean of its divisors is an integer number (1588921522146).

Almost surely, 2^{21021020222012} is an apocalyptic number.

It is an amenable number.

21021020222012 is a deficient number, since it is larger than the sum of its proper divisors (17113096309492).

21021020222012 is a wasteful number, since it uses less digits than its factorization.

21021020222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327419965 (or 1327419963 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21021020222012 its reverse (21022202012012), we get a palindrome (42043222234024).

The spelling of 21021020222012 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred twenty-two thousand, twelve".