21472046 has 8 divisors (see below), whose sum is σ = 32337144. Its totient is φ = 10693000.

The previous prime is 21472039. The next prime is 21472063. The reversal of 21472046 is 64027412.

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

It is a super-2 number, since 2×21472046² = 922097518852232, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20885 + ... + 21888.

It is an arithmetic number, because the mean of its divisors is an integer number (4042143).

Almost surely, 2^21472046 is an apocalyptic number.

21472046 is a deficient number, since it is larger than the sum of its proper divisors (10865098).

21472046 is a wasteful number, since it uses less digits than its factorization.

21472046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43026.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21472046 is about 4633.7939099619. The cubic root of 21472046 is about 277.9443240297.

Adding to 21472046 its reverse (64027412), we get a palindrome (85499458).

The spelling of 21472046 in words is "twenty-one million, four hundred seventy-two thousand, forty-six".