21082641 has 4 divisors (see below), whose sum is σ = 28110192. Its totient is φ = 14055092.

The previous prime is 21082631. The next prime is 21082667. The reversal of 21082641 is 14628012.

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 a cyclic number.

It is not a de Polignac number, because 21082641 - 2⁶ = 21082577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21082631) 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, 3513771 + ... + 3513776.

It is an arithmetic number, because the mean of its divisors is an integer number (7027548).

Almost surely, 2^21082641 is an apocalyptic number.

It is an amenable number.

21082641 is a deficient number, since it is larger than the sum of its proper divisors (7027551).

21082641 is an equidigital number, since it uses as much as digits as its factorization.

21082641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027550.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21082641 is about 4591.5837137092. The cubic root of 21082641 is about 276.2538491032.

The spelling of 21082641 in words is "twenty-one million, eighty-two thousand, six hundred forty-one".