21621210432316 has 192 divisors, whose sum is σ = 44393937960960. Its totient is φ = 9117108000000.

The previous prime is 21621210432299. The next prime is 21621210432323. The reversal of 21621210432316 is 61323401212612.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1572330441 + ... + 1572344191.

It is an arithmetic number, because the mean of its divisors is an integer number (231218426880).

Almost surely, 2^{21621210432316} is an apocalyptic number.

It is an amenable number.

21621210432316 is an abundant number, since it is smaller than the sum of its proper divisors (22772727528644).

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

21621210432316 is a wasteful number, since it uses less digits than its factorization.

21621210432316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14216 (or 14214 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

Adding to 21621210432316 its reverse (61323401212612), we get a palindrome (82944611644928).

The spelling of 21621210432316 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred ten million, four hundred thirty-two thousand, three hundred sixteen".