21075793284 has 72 divisors (see below), whose sum is σ = 60857952960. Its totient is φ = 5558447232.

The previous prime is 21075793283. The next prime is 21075793303. The reversal of 21075793284 is 48239757012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21075793283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 728119 + ... + 756510.

Almost surely, 2^21075793284 is an apocalyptic number.

It is an amenable number.

21075793284 is an abundant number, since it is smaller than the sum of its proper divisors (39782159676).

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

21075793284 is a wasteful number, since it uses less digits than its factorization.

21075793284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484669 (or 1484654 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 21075793284 in words is "twenty-one billion, seventy-five million, seven hundred ninety-three thousand, two hundred eighty-four".