21828484215 has 24 divisors (see below), whose sum is σ = 37842216048. Its totient is φ = 11639957760.

The previous prime is 21828484187. The next prime is 21828484217. The reversal of 21828484215 is 51248482812.

It is a happy number.

21828484215 is a `hidden beast` number, since 2 + 182 + 8 + 48 + 421 + 5 = 666.

It is not a de Polignac number, because 21828484215 - 2⁸ = 21828483959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828484217) 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 23 ways as a sum of consecutive naturals, for example, 264847 + ... + 337343.

It is an arithmetic number, because the mean of its divisors is an integer number (1576759002).

Almost surely, 2^21828484215 is an apocalyptic number.

21828484215 is a deficient number, since it is larger than the sum of its proper divisors (16013731833).

21828484215 is a wasteful number, since it uses less digits than its factorization.

21828484215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79199 (or 79196 counting only the distinct ones).

The product of its digits is 327680, while the sum is 45.

The spelling of 21828484215 in words is "twenty-one billion, eight hundred twenty-eight million, four hundred eighty-four thousand, two hundred fifteen".