200130021 has 80 divisors (see below), whose sum is σ = 387587200. Its totient is φ = 99937152.

The previous prime is 200130013. The next prime is 200130023. The reversal of 200130021 is 120031002.

It is a happy number.

200130021 is a nontrivial binomial coefficient, being equal to C(20007, 2).

It is not a de Polignac number, because 200130021 - 2³ = 200130013 is a prime.

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 = 200129985 and 200130012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200130023) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 139335 + ... + 140763.

It is an arithmetic number, because the mean of its divisors is an integer number (4844840).

Almost surely, 2^200130021 is an apocalyptic number.

200130021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

200130021 is the 20006-th triangular number.

It is an amenable number.

200130021 is a deficient number, since it is larger than the sum of its proper divisors (187457179).

200130021 is a wasteful number, since it uses less digits than its factorization.

200130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480 (or 1471 counting only the distinct ones).

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

The square root of 200130021 is about 14146.7318133907. The cubic root of 200130021 is about 584.9302480938.

Adding to 200130021 its reverse (120031002), we get a palindrome (320161023).

The spelling of 200130021 in words is "two hundred million, one hundred thirty thousand, twenty-one".