21002222102020 has 48 divisors (see below), whose sum is σ = 44277571054080. Its totient is φ = 8368012774016.

The previous prime is 21002222101999. The next prime is 21002222102033. The reversal of 21002222102020 is 2020122220012.

It is a junction number, because it is equal to n+sod(n) for n = 21002222101985 and 21002222102003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3963909 + ... + 7597171.

It is an arithmetic number, because the mean of its divisors is an integer number (922449396960).

Almost surely, 2^{21002222102020} is an apocalyptic number.

21002222102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002222102020 is an abundant number, since it is smaller than the sum of its proper divisors (23275348952060).

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

21002222102020 is a wasteful number, since it uses less digits than its factorization.

21002222102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634404 (or 3634402 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002222102020 its reverse (2020122220012), we get a palindrome (23022344322032).

The spelling of 21002222102020 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred two thousand, twenty".