12003630021 has 12 divisors (see below), whose sum is σ = 17807187372. Its totient is φ = 7786138176.

The previous prime is 12003630017. The next prime is 12003630059.

12003630021 is a `hidden beast` number, since 12 + 0 + 0 + 3 + 630 + 0 + 21 = 666.

12003630021 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 11254239396 + 749390625 = 106086^2 + 27375^2 .

It is not a de Polignac number, because 12003630021 - 2² = 12003630017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12003629976 and 12003630003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12003630071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18023136 + ... + 18023801.

It is an arithmetic number, because the mean of its divisors is an integer number (1483932281).

Almost surely, 2^12003630021 is an apocalyptic number.

It is an amenable number.

12003630021 is a deficient number, since it is larger than the sum of its proper divisors (5803557351).

12003630021 is a wasteful number, since it uses less digits than its factorization.

12003630021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36046980 (or 36046977 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The spelling of 12003630021 in words is "twelve billion, three million, six hundred thirty thousand, twenty-one".