21489866284 has 12 divisors (see below), whose sum is σ = 37612263024. Its totient is φ = 10743505424.

The previous prime is 21489866183. The next prime is 21489866287. The reversal of 21489866284 is 48266898412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21489866287) 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, 322699 + ... + 383554.

It is an arithmetic number, because the mean of its divisors is an integer number (3134355252).

Almost surely, 2^21489866284 is an apocalyptic number.

It is an amenable number.

21489866284 is a deficient number, since it is larger than the sum of its proper divisors (16122396740).

21489866284 is a wasteful number, since it uses less digits than its factorization.

21489866284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713864 (or 713862 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 58.

It can be divided in two parts, 214898 and 66284, that added together give a palindrome (281182).

The spelling of 21489866284 in words is "twenty-one billion, four hundred eighty-nine million, eight hundred sixty-six thousand, two hundred eighty-four".