21973486478 has 16 divisors (see below), whose sum is σ = 33431840640. Its totient is φ = 10830651000.

The previous prime is 21973486439. The next prime is 21973486501. The reversal of 21973486478 is 87468437912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238148 + ... + 317271.

It is an arithmetic number, because the mean of its divisors is an integer number (2089490040).

Almost surely, 2^21973486478 is an apocalyptic number.

21973486478 is a deficient number, since it is larger than the sum of its proper divisors (11458354162).

21973486478 is a wasteful number, since it uses less digits than its factorization.

21973486478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555703.

The product of its digits is 16257024, while the sum is 59.

The spelling of 21973486478 in words is "twenty-one billion, nine hundred seventy-three million, four hundred eighty-six thousand, four hundred seventy-eight".