21222221020212 has 24 divisors (see below), whose sum is σ = 49548765311136. Its totient is φ = 7069752302368.

The previous prime is 21222221020211. The next prime is 21222221020229. The reversal of 21222221020212 is 21202012222212.

It is a super-2 number, since 2×21222221020212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222221020211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540150918 + ... + 540190205.

It is an arithmetic number, because the mean of its divisors is an integer number (2064531887964).

Almost surely, 2^{21222221020212} is an apocalyptic number.

It is an amenable number.

21222221020212 is an abundant number, since it is smaller than the sum of its proper divisors (28326544290924).

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

21222221020212 is a wasteful number, since it uses less digits than its factorization.

21222221020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080342767 (or 1080342765 counting only the distinct ones).

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

Adding to 21222221020212 its reverse (21202012222212), we get a palindrome (42424233242424).

The spelling of 21222221020212 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, twenty thousand, two hundred twelve".