21967671 has 24 divisors (see below), whose sum is σ = 32675440. Its totient is φ = 13115520.

The previous prime is 21967669. The next prime is 21967709. The reversal of 21967671 is 17676912.

It is not a de Polignac number, because 21967671 - 2¹ = 21967669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26085 + ... + 26913.

Almost surely, 2^21967671 is an apocalyptic number.

21967671 is a deficient number, since it is larger than the sum of its proper divisors (10707769).

21967671 is a wasteful number, since it uses less digits than its factorization.

21967671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 916 counting only the distinct ones).

The product of its digits is 31752, while the sum is 39.

The square root of 21967671 is about 4686.9682098346. The cubic root of 21967671 is about 280.0666125528.

The spelling of 21967671 in words is "twenty-one million, nine hundred sixty-seven thousand, six hundred seventy-one".