21472466 has 8 divisors (see below), whose sum is σ = 32228604. Its totient is φ = 10729600.

The previous prime is 21472463. The next prime is 21472481. The reversal of 21472466 is 66427412.

It can be written as a sum of positive squares in 2 ways, for example, as 21022225 + 450241 = 4585^2 + 671^2 .

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

It is a super-2 number, since 2×21472466² = 922133592242312, 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 3 ways as a sum of consecutive naturals, for example, 3686 + ... + 7518.

Almost surely, 2^21472466 is an apocalyptic number.

21472466 is a deficient number, since it is larger than the sum of its proper divisors (10756138).

21472466 is a wasteful number, since it uses less digits than its factorization.

21472466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6636.

The product of its digits is 16128, while the sum is 32.

The square root of 21472466 is about 4633.8392289763. The cubic root of 21472466 is about 277.9461362441.

Adding to 21472466 its reverse (66427412), we get a palindrome (87899878).

The spelling of 21472466 in words is "twenty-one million, four hundred seventy-two thousand, four hundred sixty-six".