21166672101 has 8 divisors (see below), whose sum is σ = 28239268224. Its totient is φ = 14102595360.

The previous prime is 21166672099. The next prime is 21166672117. The reversal of 21166672101 is 10127666112.

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

It is not a de Polignac number, because 21166672101 - 2¹ = 21166672099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166672141) 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, 2124045 + ... + 2133986.

It is an arithmetic number, because the mean of its divisors is an integer number (3529908528).

Almost surely, 2^21166672101 is an apocalyptic number.

It is an amenable number.

21166672101 is a deficient number, since it is larger than the sum of its proper divisors (7072596123).

21166672101 is a wasteful number, since it uses less digits than its factorization.

21166672101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259691.

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

The spelling of 21166672101 in words is "twenty-one billion, one hundred sixty-six million, six hundred seventy-two thousand, one hundred one".