21212130040304 has 40 divisors (see below), whose sum is σ = 49732641023328. Its totient is φ = 8556153292800.

The previous prime is 21212130040271. The next prime is 21212130040327. The reversal of 21212130040304 is 40304003121212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212130040304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5570410397 + ... + 5570414204.

Almost surely, 2^{21212130040304} is an apocalyptic number.

It is an amenable number.

21212130040304 is an abundant number, since it is smaller than the sum of its proper divisors (28520510983024).

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

21212130040304 is a wasteful number, since it uses less digits than its factorization.

21212130040304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11140824633 (or 11140824627 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21212130040304 its reverse (40304003121212), we get a palindrome (61516133161516).

The spelling of 21212130040304 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirty million, forty thousand, three hundred four".