21150006056566 has 8 divisors (see below), whose sum is σ = 31725862455024. Its totient is φ = 10574718571560.

The previous prime is 21150006056563. The next prime is 21150006056591. The reversal of 21150006056566 is 66565060005112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150006056563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142135410 + ... + 142284133.

It is an arithmetic number, because the mean of its divisors is an integer number (3965732806878).

Almost surely, 2^{21150006056566} is an apocalyptic number.

21150006056566 is a deficient number, since it is larger than the sum of its proper divisors (10575856398458).

21150006056566 is a wasteful number, since it uses less digits than its factorization.

21150006056566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284456726.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 21150006056566 in words is "twenty-one trillion, one hundred fifty billion, six million, fifty-six thousand, five hundred sixty-six".