21020312201020 has 96 divisors (see below), whose sum is σ = 48468402855936. Its totient is φ = 7594114694400.

The previous prime is 21020312200961. The next prime is 21020312201029. The reversal of 21020312201020 is 2010221302012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21020312200985 and 21020312201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020312201029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313969669 + ... + 314036611.

It is an arithmetic number, because the mean of its divisors is an integer number (504879196416).

Almost surely, 2^{21020312201020} is an apocalyptic number.

21020312201020 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 21020312201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24234201427968).

21020312201020 is an abundant number, since it is smaller than the sum of its proper divisors (27448090654916).

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

21020312201020 is a wasteful number, since it uses less digits than its factorization.

21020312201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76211 (or 76209 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21020312201020 its reverse (2010221302012), we get a palindrome (23030533503032).

The spelling of 21020312201020 in words is "twenty-one trillion, twenty billion, three hundred twelve million, two hundred one thousand, twenty".