21778464082 has 8 divisors (see below), whose sum is σ = 32831856000. Its totient is φ = 10834512084.

The previous prime is 21778464079. The next prime is 21778464121. The reversal of 21778464082 is 28046487712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27359482 + ... + 27360277.

It is an arithmetic number, because the mean of its divisors is an integer number (4103982000).

Almost surely, 2^21778464082 is an apocalyptic number.

21778464082 is a deficient number, since it is larger than the sum of its proper divisors (11053391918).

21778464082 is a wasteful number, since it uses less digits than its factorization.

21778464082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54719960.

The product of its (nonzero) digits is 1204224, while the sum is 49.

The spelling of 21778464082 in words is "twenty-one billion, seven hundred seventy-eight million, four hundred sixty-four thousand, eighty-two".