21202212222012 has 48 divisors (see below), whose sum is σ = 52612693620480. Its totient is φ = 6622371877632.

The previous prime is 21202212221963. The next prime is 21202212222017. The reversal of 21202212222012 is 21022221220212.

It is a super-3 number, since 3×21202212222012³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21202212222012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202212222017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228879712 + ... + 228972327.

It is an arithmetic number, because the mean of its divisors is an integer number (1096097783760).

Almost surely, 2^{21202212222012} is an apocalyptic number.

It is an amenable number.

21202212222012 is an abundant number, since it is smaller than the sum of its proper divisors (31410481398468).

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

21202212222012 is a wasteful number, since it uses less digits than its factorization.

21202212222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457852290 (or 457852288 counting only the distinct ones).

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

Adding to 21202212222012 its reverse (21022221220212), we get a palindrome (42224433442224).

The spelling of 21202212222012 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, two hundred twenty-two thousand, twelve".