21706672008550 has 24 divisors (see below), whose sum is σ = 40927484051496. Its totient is φ = 8563728133440.

The previous prime is 21706672008521. The next prime is 21706672008551. The reversal of 21706672008550 is 5580027660712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21706672008494 and 21706672008503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706672008551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2973513064 + ... + 2973520363.

It is an arithmetic number, because the mean of its divisors is an integer number (1705311835479).

Almost surely, 2^{21706672008550} is an apocalyptic number.

21706672008550 is a deficient number, since it is larger than the sum of its proper divisors (19220812042946).

21706672008550 is a wasteful number, since it uses less digits than its factorization.

21706672008550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5947033512 (or 5947033507 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 21706672008550 in words is "twenty-one trillion, seven hundred six billion, six hundred seventy-two million, eight thousand, five hundred fifty".