21706116216 has 64 divisors (see below), whose sum is σ = 54489905280. Its totient is φ = 7205493120.

The previous prime is 21706116199. The next prime is 21706116233. The reversal of 21706116216 is 61261160712.

It is an interprime number because it is at equal distance from previous prime (21706116199) and next prime (21706116233).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6562035 + ... + 6565341.

It is an arithmetic number, because the mean of its divisors is an integer number (851404770).

Almost surely, 2^21706116216 is an apocalyptic number.

It is an amenable number.

21706116216 is an abundant number, since it is smaller than the sum of its proper divisors (32783789064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21706116216 is a wasteful number, since it uses less digits than its factorization.

21706116216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364 (or 4360 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

Adding to 21706116216 its reverse (61261160712), we get a palindrome (82967276928).

The spelling of 21706116216 in words is "twenty-one billion, seven hundred six million, one hundred sixteen thousand, two hundred sixteen".