21117073671 has 12 divisors (see below), whose sum is σ = 30612560472. Its totient is φ = 14027224176.

The previous prime is 21117073661. The next prime is 21117073693. The reversal of 21117073671 is 17637071112.

It is not a de Polignac number, because 21117073671 - 2¹¹ = 21117071623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21117073661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4232781 + ... + 4237766.

It is an arithmetic number, because the mean of its divisors is an integer number (2551046706).

Almost surely, 2^21117073671 is an apocalyptic number.

21117073671 is a deficient number, since it is larger than the sum of its proper divisors (9495486801).

21117073671 is a wasteful number, since it uses less digits than its factorization.

21117073671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8470830 (or 8470827 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The spelling of 21117073671 in words is "twenty-one billion, one hundred seventeen million, seventy-three thousand, six hundred seventy-one".