21125466 has 24 divisors (see below), whose sum is σ = 46747584. Its totient is φ = 6891720.

The previous prime is 21125443. The next prime is 21125471. The reversal of 21125466 is 66452112.

21125466 is a `hidden beast` number, since 2 + 112 + 546 + 6 = 666.

It is a super-3 number, since 3×21125466³ (a number of 23 digits) contains 333 as substring.

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 in 11 ways as a sum of consecutive naturals, for example, 11640 + ... + 13331.

It is an arithmetic number, because the mean of its divisors is an integer number (1947816).

Almost surely, 2^21125466 is an apocalyptic number.

21125466 is an abundant number, since it is smaller than the sum of its proper divisors (25622118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21125466 is a wasteful number, since it uses less digits than its factorization.

21125466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25026 (or 25023 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21125466 is about 4596.2447715499. The cubic root of 21125466 is about 276.4407733389.

Adding to 21125466 its reverse (66452112), we get a palindrome (87577578).

The spelling of 21125466 in words is "twenty-one million, one hundred twenty-five thousand, four hundred sixty-six".