21202221222012 has 24 divisors (see below), whose sum is σ = 49596463759696. Its totient is φ = 7049605039488.

The previous prime is 21202221221989. The next prime is 21202221222047. The reversal of 21202221222012 is 21022212220212.

It is a self number, because there is not a number n which added to its sum of digits gives 21202221222012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2225249353 + ... + 2225258880.

Almost surely, 2^{21202221222012} is an apocalyptic number.

It is an amenable number.

21202221222012 is an abundant number, since it is smaller than the sum of its proper divisors (28394242537684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202221222012 is a wasteful number, since it uses less digits than its factorization.

21202221222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4450508637 (or 4450508635 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21202221222012 its reverse (21022212220212), we get a palindrome (42224433442224).

The spelling of 21202221222012 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, two hundred twenty-two thousand, twelve".