21105310702272 has 56 divisors (see below), whose sum is σ = 55841894564400. Its totient is φ = 7035007819776.

The previous prime is 21105310702271. The next prime is 21105310702309. The reversal of 21105310702272 is 27220701350112.

It is not an unprimeable number, because it can be changed into a prime (21105310702271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14168604 + ... + 15587172.

It is an arithmetic number, because the mean of its divisors is an integer number (997176688650).

Almost surely, 2^{21105310702272} is an apocalyptic number.

It is an amenable number.

21105310702272 is an abundant number, since it is smaller than the sum of its proper divisors (34736583862128).

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

21105310702272 is a wasteful number, since it uses less digits than its factorization.

21105310702272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496073 (or 1496063 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 21105310702272 in words is "twenty-one trillion, one hundred five billion, three hundred ten million, seven hundred two thousand, two hundred seventy-two".