210021120300020 has 192 divisors, whose sum is σ = 474115726780416. Its totient is φ = 77868278415360.

The previous prime is 210021120300001. The next prime is 210021120300083. The reversal of 210021120300020 is 20003021120012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210021120299968 and 210021120300004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24497968454 + ... + 24497977026.

It is an arithmetic number, because the mean of its divisors is an integer number (2469352743648).

Almost surely, 2^{210021120300020} is an apocalyptic number.

210021120300020 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 210021120300020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237057863390208).

210021120300020 is an abundant number, since it is smaller than the sum of its proper divisors (264094606480396).

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

210021120300020 is a wasteful number, since it uses less digits than its factorization.

210021120300020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12250 (or 12248 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 210021120300020 its reverse (20003021120012), we get a palindrome (230024141420032).

The spelling of 210021120300020 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty million, three hundred thousand, twenty".