21531355330330 has 16 divisors (see below), whose sum is σ = 38756699198280. Its totient is φ = 8612484442432.

The previous prime is 21531355330319. The next prime is 21531355330343. The reversal of 21531355330330 is 3303355313512.

It can be written as a sum of positive squares in 4 ways, for example, as 5970247541281 + 15561107789049 = 2443409^2 + 3944757^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21531355330330.

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, 5627089 + ... + 8644468.

Almost surely, 2^{21531355330330} is an apocalyptic number.

21531355330330 is a deficient number, since it is larger than the sum of its proper divisors (17225343867950).

21531355330330 is a wasteful number, since it uses less digits than its factorization.

21531355330330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14422433.

The product of its (nonzero) digits is 182250, while the sum is 37.

The spelling of 21531355330330 in words is "twenty-one trillion, five hundred thirty-one billion, three hundred fifty-five million, three hundred thirty thousand, three hundred thirty".