210030100020 has 72 divisors (see below), whose sum is σ = 686098334376. Its totient is φ = 51699716352.

The previous prime is 210030100013. The next prime is 210030100087. The reversal of 210030100020 is 20001030012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42536484 + 209987563536 = 6522^2 + 458244^2 .

It is a super-2 number, since 2×210030100020² (a number of 23 digits) contains 22 as substring.

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 = 210030099975 and 210030100011.

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, 44875887 + ... + 44880566.

It is an arithmetic number, because the mean of its divisors is an integer number (9529143533).

Almost surely, 2^210030100020 is an apocalyptic number.

210030100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210030100020 is an abundant number, since it is smaller than the sum of its proper divisors (476068234356).

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

210030100020 is a wasteful number, since it uses less digits than its factorization.

210030100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89756481 (or 89756476 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 210030100020 its reverse (20001030012), we get a palindrome (230031130032).

The spelling of 210030100020 in words is "two hundred ten billion, thirty million, one hundred thousand, twenty".