21984785308 has 48 divisors (see below), whose sum is σ = 39406768128. Its totient is φ = 10729224000.

The previous prime is 21984785293. The next prime is 21984785353. The reversal of 21984785308 is 80358748912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15918778 + ... + 15920158.

It is an arithmetic number, because the mean of its divisors is an integer number (820974336).

Almost surely, 2^21984785308 is an apocalyptic number.

It is an amenable number.

21984785308 is a deficient number, since it is larger than the sum of its proper divisors (17421982820).

21984785308 is a wasteful number, since it uses less digits than its factorization.

21984785308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 21984785308 in words is "twenty-one billion, nine hundred eighty-four million, seven hundred eighty-five thousand, three hundred eight".