21482661 has 4 divisors (see below), whose sum is σ = 28643552. Its totient is φ = 14321772.

The previous prime is 21482633. The next prime is 21482663. The reversal of 21482661 is 16628412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21482661 - 2¹⁵ = 21449893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21482663) by changing a digit.

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, 3580441 + ... + 3580446.

It is an arithmetic number, because the mean of its divisors is an integer number (7160888).

Almost surely, 2^21482661 is an apocalyptic number.

It is an amenable number.

21482661 is a deficient number, since it is larger than the sum of its proper divisors (7160891).

21482661 is an equidigital number, since it uses as much as digits as its factorization.

21482661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7160890.

The product of its digits is 4608, while the sum is 30.

The square root of 21482661 is about 4634.9391581767. The cubic root of 21482661 is about 277.9901183452.

The spelling of 21482661 in words is "twenty-one million, four hundred eighty-two thousand, six hundred sixty-one".