21296671 has 8 divisors (see below), whose sum is σ = 23799888. Its totient is φ = 18888000.

The previous prime is 21296669. The next prime is 21296677. The reversal of 21296671 is 17669212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21296671 - 2¹ = 21296669 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 (21296677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23160 + ... + 24061.

It is an arithmetic number, because the mean of its divisors is an integer number (2974986).

Almost surely, 2^21296671 is an apocalyptic number.

21296671 is a deficient number, since it is larger than the sum of its proper divisors (2503217).

21296671 is a wasteful number, since it uses less digits than its factorization.

21296671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47273.

The product of its digits is 9072, while the sum is 34.

The square root of 21296671 is about 4614.8316328984. The cubic root of 21296671 is about 277.1855421275.

It can be divided in two parts, 21 and 296671, that added together give a palindrome (296692).

The spelling of 21296671 in words is "twenty-one million, two hundred ninety-six thousand, six hundred seventy-one".