21668534054 has 8 divisors (see below), whose sum is σ = 32547145440. Its totient is φ = 10819485576.

The previous prime is 21668534029. The next prime is 21668534087. The reversal of 21668534054 is 45043586612.

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

It is a junction number, because it is equal to n+sod(n) for n = 21668533996 and 21668534014.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 7388894 + ... + 7391825.

It is an arithmetic number, because the mean of its divisors is an integer number (4068393180).

Almost surely, 2^21668534054 is an apocalyptic number.

21668534054 is a deficient number, since it is larger than the sum of its proper divisors (10878611386).

21668534054 is a wasteful number, since it uses less digits than its factorization.

21668534054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14781454.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 21668534054 in words is "twenty-one billion, six hundred sixty-eight million, five hundred thirty-four thousand, fifty-four".