21011010222020 has 144 divisors (see below), whose sum is σ = 55324642005360. Its totient is φ = 6643680777216.

The previous prime is 21011010222017. The next prime is 21011010222053. The reversal of 21011010222020 is 2022201011012.

It can be written as a sum of positive squares in 8 ways, for example, as 7054166017024 + 13956844204996 = 2655968^2 + 3735886^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21011010221986 and 21011010222004.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13492346 + ... + 14968814.

It is an arithmetic number, because the mean of its divisors is an integer number (384198902815).

Almost surely, 2^{21011010222020} is an apocalyptic number.

21011010222020 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 21011010222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27662321002680).

21011010222020 is an abundant number, since it is smaller than the sum of its proper divisors (34313631783340).

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

21011010222020 is a wasteful number, since it uses less digits than its factorization.

21011010222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477622 (or 1477613 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21011010222020 its reverse (2022201011012), we get a palindrome (23033211233032).

The spelling of 21011010222020 in words is "twenty-one trillion, eleven billion, ten million, two hundred twenty-two thousand, twenty".