21584943912 has 64 divisors (see below), whose sum is σ = 61691443200. Its totient is φ = 6165109440.

The previous prime is 21584943839. The next prime is 21584943917. The reversal of 21584943912 is 21934948512.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21584943917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538237 + ... + 576947.

It is an arithmetic number, because the mean of its divisors is an integer number (963928800).

Almost surely, 2^21584943912 is an apocalyptic number.

It is an amenable number.

21584943912 is an abundant number, since it is smaller than the sum of its proper divisors (40106499288).

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

21584943912 is a wasteful number, since it uses less digits than its factorization.

21584943912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42046 (or 42042 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The spelling of 21584943912 in words is "twenty-one billion, five hundred eighty-four million, nine hundred forty-three thousand, nine hundred twelve".