21878964364 has 24 divisors (see below), whose sum is σ = 40023603200. Its totient is φ = 10452583440.

The previous prime is 21878964353. The next prime is 21878964389. The reversal of 21878964364 is 46346987812.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21878964299 and 21878964308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106934 + ... + 1126525.

Almost surely, 2^21878964364 is an apocalyptic number.

It is an amenable number.

21878964364 is a deficient number, since it is larger than the sum of its proper divisors (18144638836).

21878964364 is a wasteful number, since it uses less digits than its factorization.

21878964364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233573 (or 2233571 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 58.

The spelling of 21878964364 in words is "twenty-one billion, eight hundred seventy-eight million, nine hundred sixty-four thousand, three hundred sixty-four".