21472465 has 8 divisors (see below), whose sum is σ = 29448000. Its totient is φ = 14723952.

The previous prime is 21472463. The next prime is 21472481. The reversal of 21472465 is 56427412.

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 21472465 - 2¹ = 21472463 is a prime.

It is a super-2 number, since 2×21472465² = 922133506352450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472463) 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, 306715 + ... + 306784.

It is an arithmetic number, because the mean of its divisors is an integer number (3681000).

Almost surely, 2^21472465 is an apocalyptic number.

It is an amenable number.

21472465 is a deficient number, since it is larger than the sum of its proper divisors (7975535).

21472465 is an equidigital number, since it uses as much as digits as its factorization.

21472465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613511.

The product of its digits is 13440, while the sum is 31.

The square root of 21472465 is about 4633.8391210744. The cubic root of 21472465 is about 277.9461319293.

Adding to 21472465 its reverse (56427412), we get a palindrome (77899877).

The spelling of 21472465 in words is "twenty-one million, four hundred seventy-two thousand, four hundred sixty-five".