21010522555 has 16 divisors (see below), whose sum is σ = 27510617088. Its totient is φ = 15277084000.

The previous prime is 21010522553. The next prime is 21010522579. The reversal of 21010522555 is 55522501012.

It is not a de Polignac number, because 21010522555 - 2¹ = 21010522553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010522553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232470 + ... + 309940.

It is an arithmetic number, because the mean of its divisors is an integer number (1719413568).

Almost surely, 2^21010522555 is an apocalyptic number.

21010522555 is a deficient number, since it is larger than the sum of its proper divisors (6500094533).

21010522555 is a wasteful number, since it uses less digits than its factorization.

21010522555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82418.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 21010522555 in words is "twenty-one billion, ten million, five hundred twenty-two thousand, five hundred fifty-five".