21114471 has 16 divisors (see below), whose sum is σ = 32258304. Its totient is φ = 12033984.

The previous prime is 21114463. The next prime is 21114521. The reversal of 21114471 is 17441112.

It is not a de Polignac number, because 21114471 - 2³ = 21114463 is a prime.

It is a super-3 number, since 3×21114471³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114451) 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, 8731 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (2016144).

Almost surely, 2^21114471 is an apocalyptic number.

21114471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21114471 is a deficient number, since it is larger than the sum of its proper divisors (11143833).

21114471 is a wasteful number, since it uses less digits than its factorization.

21114471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630.

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

The square root of 21114471 is about 4595.0485307557. The cubic root of 21114471 is about 276.3928060536.

Adding to 21114471 its reverse (17441112), we get a palindrome (38555583).

The spelling of 21114471 in words is "twenty-one million, one hundred fourteen thousand, four hundred seventy-one".