21002120212012 has 6 divisors (see below), whose sum is σ = 36753710371028. Its totient is φ = 10501060106004.

The previous prime is 21002120212001. The next prime is 21002120212069. The reversal of 21002120212012 is 21021202120012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625265026498 + ... + 2625265026505.

Almost surely, 2^{21002120212012} is an apocalyptic number.

It is an amenable number.

21002120212012 is a deficient number, since it is larger than the sum of its proper divisors (15751590159016).

21002120212012 is a wasteful number, since it uses less digits than its factorization.

21002120212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250530053007 (or 5250530053005 counting only the distinct ones).

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

Adding to 21002120212012 its reverse (21021202120012), we get a palindrome (42023322332024).

The spelling of 21002120212012 in words is "twenty-one trillion, two billion, one hundred twenty million, two hundred twelve thousand, twelve".