21106517067 has 12 divisors (see below), whose sum is σ = 30513647944. Its totient is φ = 14058800640.

The previous prime is 21106517041. The next prime is 21106517071. The reversal of 21106517067 is 76071560112.

It is not a de Polignac number, because 21106517067 - 2²² = 21102322763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21106517077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1006609 + ... + 1027362.

Almost surely, 2^21106517067 is an apocalyptic number.

21106517067 is a deficient number, since it is larger than the sum of its proper divisors (9407130877).

21106517067 is a wasteful number, since it uses less digits than its factorization.

21106517067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035130 (or 2035127 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 21106517067 in words is "twenty-one billion, one hundred six million, five hundred seventeen thousand, sixty-seven".