21411471 has 8 divisors (see below), whose sum is σ = 29245104. Its totient is φ = 13926080.

The previous prime is 21411469. The next prime is 21411473. The reversal of 21411471 is 17411412.

It is an interprime number because it is at equal distance from previous prime (21411469) and next prime (21411473).

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 21411471 - 2¹ = 21411469 is a prime.

It is a super-3 number, since 3×21411471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411473) 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, 86916 + ... + 87161.

It is an arithmetic number, because the mean of its divisors is an integer number (3655638).

Almost surely, 2^21411471 is an apocalyptic number.

21411471 is a deficient number, since it is larger than the sum of its proper divisors (7833633).

21411471 is a wasteful number, since it uses less digits than its factorization.

21411471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174121.

The product of its digits is 224, while the sum is 21.

The square root of 21411471 is about 4627.2530728284. The cubic root of 21411471 is about 277.6827073707.

Adding to 21411471 its reverse (17411412), we get a palindrome (38822883).

It can be divided in two parts, 214114 and 71, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 21411471 in words is "twenty-one million, four hundred eleven thousand, four hundred seventy-one".