21043402284 has 12 divisors (see below), whose sum is σ = 49101272024. Its totient is φ = 7014467424.

The previous prime is 21043402283. The next prime is 21043402339. The reversal of 21043402284 is 48220434012.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21043402283) 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, 876808417 + ... + 876808440.

Almost surely, 2^21043402284 is an apocalyptic number.

It is an amenable number.

21043402284 is an abundant number, since it is smaller than the sum of its proper divisors (28057869740).

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

21043402284 is a wasteful number, since it uses less digits than its factorization.

21043402284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753616864 (or 1753616862 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 21043402284 its reverse (48220434012), we get a palindrome (69263836296).

The spelling of 21043402284 in words is "twenty-one billion, forty-three million, four hundred two thousand, two hundred eighty-four".