21102122022020 has 48 divisors (see below), whose sum is σ = 47731395437040. Its totient is φ = 7790224605696.

The previous prime is 21102122021993. The next prime is 21102122022053. The reversal of 21102122022020 is 2022022120112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5399479447684 + 15702642574336 = 2323678^2 + 3962656^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21102122022020.

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, 5388527 + ... + 8440406.

It is an arithmetic number, because the mean of its divisors is an integer number (994404071605).

Almost surely, 2^{21102122022020} is an apocalyptic number.

21102122022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102122022020 is an abundant number, since it is smaller than the sum of its proper divisors (26629273415020).

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

21102122022020 is a wasteful number, since it uses less digits than its factorization.

21102122022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13834824 (or 13834822 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21102122022020 its reverse (2022022120112), we get a palindrome (23124144142132).

The spelling of 21102122022020 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-two million, twenty-two thousand, twenty".