21030763255 has 8 divisors (see below), whose sum is σ = 25238714400. Its totient is φ = 16823411616.

The previous prime is 21030763157. The next prime is 21030763261. The reversal of 21030763255 is 55236703012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21030763255 - 2⁹ = 21030762743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21030763255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68700 + ... + 216289.

It is an arithmetic number, because the mean of its divisors is an integer number (3154839300).

Almost surely, 2^21030763255 is an apocalyptic number.

21030763255 is a deficient number, since it is larger than the sum of its proper divisors (4207951145).

21030763255 is a wasteful number, since it uses less digits than its factorization.

21030763255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299753.

The product of its (nonzero) digits is 37800, while the sum is 34.

The spelling of 21030763255 in words is "twenty-one billion, thirty million, seven hundred sixty-three thousand, two hundred fifty-five".