21103203021312 has 240 divisors, whose sum is σ = 59228118354240. Its totient is φ = 6663979745280.

The previous prime is 21103203021287. The next prime is 21103203021331. The reversal of 21103203021312 is 21312030230112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9014609262 + ... + 9014611602.

It is an arithmetic number, because the mean of its divisors is an integer number (246783826476).

Almost surely, 2^{21103203021312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103203021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29614059177120).

21103203021312 is an abundant number, since it is smaller than the sum of its proper divisors (38124915332928).

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

21103203021312 is an frugal number, since it uses more digits than its factorization.

21103203021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835 (or 2478 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21103203021312 its reverse (21312030230112), we get a palindrome (42415233251424).

The spelling of 21103203021312 in words is "twenty-one trillion, one hundred three billion, two hundred three million, twenty-one thousand, three hundred twelve".