21821428482 has 16 divisors (see below), whose sum is σ = 49877550912. Its totient is φ = 6234693840.

The previous prime is 21821428481. The next prime is 21821428523. The reversal of 21821428482 is 28482412812.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 519557821 = 21821428482 / (2 + 1 + 8 + 2 + 1 + 4 + 2 + 8 + 4 + 8 + 2).

It is not an unprimeable number, because it can be changed into a prime (21821428481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259778869 + ... + 259778952.

It is an arithmetic number, because the mean of its divisors is an integer number (3117346932).

Almost surely, 2^21821428482 is an apocalyptic number.

21821428482 is an abundant number, since it is smaller than the sum of its proper divisors (28056122430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21821428482 is a wasteful number, since it uses less digits than its factorization.

21821428482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519557833.

The product of its digits is 131072, while the sum is 42.

The spelling of 21821428482 in words is "twenty-one billion, eight hundred twenty-one million, four hundred twenty-eight thousand, four hundred eighty-two".