21780468682 has 16 divisors (see below), whose sum is σ = 37357571520. Its totient is φ = 9329580288.

The previous prime is 21780468659. The next prime is 21780468701. The reversal of 21780468682 is 28686408712.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381207 + ... + 434602.

It is an arithmetic number, because the mean of its divisors is an integer number (2334848220).

Almost surely, 2^21780468682 is an apocalyptic number.

21780468682 is a deficient number, since it is larger than the sum of its proper divisors (15577102838).

21780468682 is a wasteful number, since it uses less digits than its factorization.

21780468682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817725.

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 21780468682 in words is "twenty-one billion, seven hundred eighty million, four hundred sixty-eight thousand, six hundred eighty-two".