21471412 has 6 divisors (see below), whose sum is σ = 37574978. Its totient is φ = 10735704.

The previous prime is 21471409. The next prime is 21471449. The reversal of 21471412 is 21417412.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 3118756 = 4284^2 + 1766^2 .

It is a super-2 number, since 2×21471412² = 922043066547488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2683923 + ... + 2683930.

Almost surely, 2^21471412 is an apocalyptic number.

It is an amenable number.

21471412 is a deficient number, since it is larger than the sum of its proper divisors (16103566).

21471412 is a wasteful number, since it uses less digits than its factorization.

21471412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5367857 (or 5367855 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 21471412 is about 4633.7254989911. The cubic root of 21471412 is about 277.9415884041.

Adding to 21471412 its reverse (21417412), we get a palindrome (42888824).

The spelling of 21471412 in words is "twenty-one million, four hundred seventy-one thousand, four hundred twelve".