21167471 has 8 divisors (see below), whose sum is σ = 22977024. Its totient is φ = 19383840.

The previous prime is 21167467. The next prime is 21167491. The reversal of 21167471 is 17476112.

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 21167471 - 2² = 21167467 is a prime.

It is a super-3 number, since 3×21167471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167401) 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, 4760 + ... + 8061.

It is an arithmetic number, because the mean of its divisors is an integer number (2872128).

Almost surely, 2^21167471 is an apocalyptic number.

21167471 is a deficient number, since it is larger than the sum of its proper divisors (1809553).

21167471 is a wasteful number, since it uses less digits than its factorization.

21167471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961.

The product of its digits is 2352, while the sum is 29.

The square root of 21167471 is about 4600.8119935507. The cubic root of 21167471 is about 276.6238731574.

The spelling of 21167471 in words is "twenty-one million, one hundred sixty-seven thousand, four hundred seventy-one".