21666771113 has 16 divisors (see below), whose sum is σ = 23432166912. Its totient is φ = 19915632000.

The previous prime is 21666771083. The next prime is 21666771169. The reversal of 21666771113 is 31117766612.

It is a cyclic number.

It is not a de Polignac number, because 21666771113 - 2²² = 21662576809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21666774113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4261733 + ... + 4266813.

It is an arithmetic number, because the mean of its divisors is an integer number (1464510432).

Almost surely, 2^21666771113 is an apocalyptic number.

It is an amenable number.

21666771113 is a deficient number, since it is larger than the sum of its proper divisors (1765395799).

21666771113 is a wasteful number, since it uses less digits than its factorization.

21666771113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416.

The product of its digits is 63504, while the sum is 41.

The spelling of 21666771113 in words is "twenty-one billion, six hundred sixty-six million, seven hundred seventy-one thousand, one hundred thirteen".