21222211011020 has 24 divisors (see below), whose sum is σ = 44597830477200. Its totient is φ = 8482943956032.

The previous prime is 21222211011019. The next prime is 21222211011031. The reversal of 21222211011020 is 2011011222212.

It is a super-2 number, since 2×21222211011020² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21222211011020.

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, 371248730 + ... + 371305889.

It is an arithmetic number, because the mean of its divisors is an integer number (1858242936550).

Almost surely, 2^{21222211011020} is an apocalyptic number.

21222211011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222211011020 is an abundant number, since it is smaller than the sum of its proper divisors (23375619466180).

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

21222211011020 is a wasteful number, since it uses less digits than its factorization.

21222211011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742556057 (or 742556055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222211011020 its reverse (2011011222212), we get a palindrome (23233222233232).

The spelling of 21222211011020 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, eleven thousand, twenty".