21821428484 has 12 divisors (see below), whose sum is σ = 40197368400. Its totient is φ = 10336466088.

The previous prime is 21821428481. The next prime is 21821428523. The reversal of 21821428484 is 48482412812.

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 3 ways as a sum of consecutive naturals, for example, 143561954 + ... + 143562105.

It is an arithmetic number, because the mean of its divisors is an integer number (3349780700).

Almost surely, 2^21821428484 is an apocalyptic number.

It is an amenable number.

21821428484 is a deficient number, since it is larger than the sum of its proper divisors (18375939916).

21821428484 is a wasteful number, since it uses less digits than its factorization.

21821428484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287124082 (or 287124080 counting only the distinct ones).

The product of its digits is 262144, while the sum is 44.

The spelling of 21821428484 in words is "twenty-one billion, eight hundred twenty-one million, four hundred twenty-eight thousand, four hundred eighty-four".