21204330012 has 60 divisors (see below), whose sum is σ = 55764379440. Its totient is φ = 7025768064.

The previous prime is 21204330001. The next prime is 21204330013. The reversal of 21204330012 is 21003340212.

It is a super-2 number, since 2×21204330012² (a number of 21 digits) contains 22 as substring.

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 (21204330013) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 141837 + ... + 250052.

It is an arithmetic number, because the mean of its divisors is an integer number (929406324).

Almost surely, 2^21204330012 is an apocalyptic number.

It is an amenable number.

21204330012 is an abundant number, since it is smaller than the sum of its proper divisors (34560049428).

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

21204330012 is a wasteful number, since it uses less digits than its factorization.

21204330012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392072 (or 392061 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21204330012 its reverse (21003340212), we get a palindrome (42207670224).

The spelling of 21204330012 in words is "twenty-one billion, two hundred four million, three hundred thirty thousand, twelve".