21366504205054 has 8 divisors (see below), whose sum is σ = 33443223973200. Its totient is φ = 10218762880656.

The previous prime is 21366504205037. The next prime is 21366504205063. The reversal of 21366504205054 is 45050240566312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21366504205054.

It is a congruent number.

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, 232244610879 + ... + 232244610970.

It is an arithmetic number, because the mean of its divisors is an integer number (4180402996650).

Almost surely, 2^{21366504205054} is an apocalyptic number.

21366504205054 is a deficient number, since it is larger than the sum of its proper divisors (12076719768146).

21366504205054 is a wasteful number, since it uses less digits than its factorization.

21366504205054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464489221874.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 21366504205054 in words is "twenty-one trillion, three hundred sixty-six billion, five hundred four million, two hundred five thousand, fifty-four".