210002001100020 has 72 divisors (see below), whose sum is σ = 654222450294504. Its totient is φ = 54487005689088.

The previous prime is 210002001099977. The next prime is 210002001100039. The reversal of 210002001100020 is 20001100200012.

It can be written as a sum of positive squares in 4 ways, for example, as 125425395625104 + 84576605474916 = 11199348^2 + 9196554^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210002001099975 and 210002001100011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15765909339 + ... + 15765922658.

It is an arithmetic number, because the mean of its divisors is an integer number (9086422920757).

Almost surely, 2^{210002001100020} is an apocalyptic number.

210002001100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210002001100020 is an abundant number, since it is smaller than the sum of its proper divisors (444220449194484).

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

210002001100020 is a wasteful number, since it uses less digits than its factorization.

210002001100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31531832049 (or 31531832044 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210002001100020 its reverse (20001100200012), we get a palindrome (230003101300032).

The spelling of 210002001100020 in words is "two hundred ten trillion, two billion, one million, one hundred thousand, twenty".