21606671101 has 8 divisors (see below), whose sum is σ = 22879032120. Its totient is φ = 20334463488.

The previous prime is 21606671083. The next prime is 21606671111. The reversal of 21606671101 is 10117660612.

It can be written as a sum of positive squares in 4 ways, for example, as 8793563076 + 12813108025 = 93774^2 + 113195^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21606671101 - 2⁵ = 21606671069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606671111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385665 + ... + 438121.

It is an arithmetic number, because the mean of its divisors is an integer number (2859879015).

Almost surely, 2^21606671101 is an apocalyptic number.

It is an amenable number.

21606671101 is a deficient number, since it is larger than the sum of its proper divisors (1272361019).

21606671101 is a wasteful number, since it uses less digits than its factorization.

21606671101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76703.

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 21606671101 in words is "twenty-one billion, six hundred six million, six hundred seventy-one thousand, one hundred one".