21982630478 has 4 divisors (see below), whose sum is σ = 32973945720. Its totient is φ = 10991315238.

The previous prime is 21982630433. The next prime is 21982630499. The reversal of 21982630478 is 87403628912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495657618 + ... + 5495657621.

It is an arithmetic number, because the mean of its divisors is an integer number (8243486430).

Almost surely, 2^21982630478 is an apocalyptic number.

21982630478 is a deficient number, since it is larger than the sum of its proper divisors (10991315242).

21982630478 is a wasteful number, since it uses less digits than its factorization.

21982630478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10991315241.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 21982630478 in words is "twenty-one billion, nine hundred eighty-two million, six hundred thirty thousand, four hundred seventy-eight".