21214671 has 16 divisors (see below), whose sum is σ = 30240000. Its totient is φ = 13196480.

The previous prime is 21214667. The next prime is 21214673. The reversal of 21214671 is 17641212.

It is not a de Polignac number, because 21214671 - 2² = 21214667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 921 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (1890000).

Almost surely, 2^21214671 is an apocalyptic number.

21214671 is a deficient number, since it is larger than the sum of its proper divisors (9025329).

21214671 is a wasteful number, since it uses less digits than its factorization.

21214671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7566.

The product of its digits is 672, while the sum is 24.

The square root of 21214671 is about 4605.9386665478. The cubic root of 21214671 is about 276.8293291940.

Adding to 21214671 its reverse (17641212), we get a palindrome (38855883).

The spelling of 21214671 in words is "twenty-one million, two hundred fourteen thousand, six hundred seventy-one".