21112377671 has 16 divisors (see below), whose sum is σ = 27171022848. Its totient is φ = 15920517600.

The previous prime is 21112377659. The next prime is 21112377701. The reversal of 21112377671 is 17677321112.

It is a cyclic number.

It is not a de Polignac number, because 21112377671 - 2²² = 21108183367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112373671) 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 15 ways as a sum of consecutive naturals, for example, 4419980 + ... + 4424753.

It is an arithmetic number, because the mean of its divisors is an integer number (1698188928).

Almost surely, 2^21112377671 is an apocalyptic number.

21112377671 is a deficient number, since it is larger than the sum of its proper divisors (6058645177).

21112377671 is a wasteful number, since it uses less digits than its factorization.

21112377671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8844782.

The product of its digits is 24696, while the sum is 38.

Adding to 21112377671 its reverse (17677321112), we get a palindrome (38789698783).

The spelling of 21112377671 in words is "twenty-one billion, one hundred twelve million, three hundred seventy-seven thousand, six hundred seventy-one".