21002282855 has 4 divisors (see below), whose sum is σ = 25202739432. Its totient is φ = 16801826280.

The previous prime is 21002282801. The next prime is 21002282857. The reversal of 21002282855 is 55828220012.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21002282855 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002282857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100228281 + ... + 2100228290.

It is an arithmetic number, because the mean of its divisors is an integer number (6300684858).

Almost surely, 2^21002282855 is an apocalyptic number.

21002282855 is a deficient number, since it is larger than the sum of its proper divisors (4200456577).

21002282855 is an equidigital number, since it uses as much as digits as its factorization.

21002282855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200456576.

The product of its (nonzero) digits is 25600, while the sum is 35.

The spelling of 21002282855 in words is "twenty-one billion, two million, two hundred eighty-two thousand, eight hundred fifty-five".