21033330012 has 36 divisors (see below), whose sum is σ = 53173160040. Its totient is φ = 7010374752.

The previous prime is 21033329981. The next prime is 21033330013. The reversal of 21033330012 is 21003333012.

21033330012 is a `hidden beast` number, since 21 + 0 + 333 + 300 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033330013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 400539 + ... + 449997.

Almost surely, 2^21033330012 is an apocalyptic number.

It is an amenable number.

21033330012 is an abundant number, since it is smaller than the sum of its proper divisors (32139830028).

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

21033330012 is a wasteful number, since it uses less digits than its factorization.

21033330012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61282 (or 61277 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21033330012 its reverse (21003333012), we get a palindrome (42036663024).

The spelling of 21033330012 in words is "twenty-one billion, thirty-three million, three hundred thirty thousand, twelve".