21006035355 has 16 divisors (see below), whose sum is σ = 35070946560. Its totient is φ = 10716122208.

The previous prime is 21006035353. The next prime is 21006035377. The reversal of 21006035355 is 55353060012.

It is not a de Polignac number, because 21006035355 - 2¹ = 21006035353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21006035353) 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, 30443185 + ... + 30443874.

It is an arithmetic number, because the mean of its divisors is an integer number (2191934160).

Almost surely, 2^21006035355 is an apocalyptic number.

21006035355 is a deficient number, since it is larger than the sum of its proper divisors (14064911205).

21006035355 is a wasteful number, since it uses less digits than its factorization.

21006035355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60887090.

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 21006035355 its reverse (55353060012), we get a palindrome (76359095367).

The spelling of 21006035355 in words is "twenty-one billion, six million, thirty-five thousand, three hundred fifty-five".