21334671 has 12 divisors (see below), whose sum is σ = 31958472. Its totient is φ = 14222952.

The previous prime is 21334669. The next prime is 21334717. The reversal of 21334671 is 17643312.

It is not a de Polignac number, because 21334671 - 2¹ = 21334669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43656 + ... + 44141.

It is an arithmetic number, because the mean of its divisors is an integer number (2663206).

Almost surely, 2^21334671 is an apocalyptic number.

21334671 is a deficient number, since it is larger than the sum of its proper divisors (10623801).

21334671 is an frugal number, since it uses more digits than its factorization.

21334671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87812 (or 87800 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 21334671 is about 4618.9469579115. The cubic root of 21334671 is about 277.3503064083.

Adding to 21334671 its reverse (17643312), we get a palindrome (38977983).

The spelling of 21334671 in words is "twenty-one million, three hundred thirty-four thousand, six hundred seventy-one".