21002222110020 has 192 divisors, whose sum is σ = 62212234291200. Its totient is φ = 5282970688512.

The previous prime is 21002222110003. The next prime is 21002222110039. The reversal of 21002222110020 is 2001122220012.

It is a super-2 number, since 2×21002222110020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1372776331 + ... + 1372791629.

It is an arithmetic number, because the mean of its divisors is an integer number (324022053600).

Almost surely, 2^{21002222110020} is an apocalyptic number.

21002222110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002222110020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31106117145600).

21002222110020 is an abundant number, since it is smaller than the sum of its proper divisors (41210012181180).

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

21002222110020 is a wasteful number, since it uses less digits than its factorization.

21002222110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29034 (or 29032 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002222110020 its reverse (2001122220012), we get a palindrome (23003344330032).

The spelling of 21002222110020 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred ten thousand, twenty".