21250466 has 4 divisors (see below), whose sum is σ = 31875702. Its totient is φ = 10625232.

The previous prime is 21250451. The next prime is 21250477. The reversal of 21250466 is 66405212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 9174841 = 3475^2 + 3029^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5312615 + ... + 5312618.

Almost surely, 2^21250466 is an apocalyptic number.

21250466 is a deficient number, since it is larger than the sum of its proper divisors (10625236).

21250466 is a wasteful number, since it uses less digits than its factorization.

21250466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10625235.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21250466 is about 4609.8227731660. The cubic root of 21250466 is about 276.9849375137.

Adding to 21250466 its reverse (66405212), we get a palindrome (87655678).

The spelling of 21250466 in words is "twenty-one million, two hundred fifty thousand, four hundred sixty-six".