21982341 has 4 divisors (see below), whose sum is σ = 29309792. Its totient is φ = 14654892.

The previous prime is 21982339. The next prime is 21982351. The reversal of 21982341 is 14328912.

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 21982341 - 2¹ = 21982339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21982299 and 21982308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982351) 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, 3663721 + ... + 3663726.

It is an arithmetic number, because the mean of its divisors is an integer number (7327448).

Almost surely, 2^21982341 is an apocalyptic number.

It is an amenable number.

21982341 is a deficient number, since it is larger than the sum of its proper divisors (7327451).

21982341 is an equidigital number, since it uses as much as digits as its factorization.

21982341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7327450.

The product of its digits is 3456, while the sum is 30.

The square root of 21982341 is about 4688.5329261934. The cubic root of 21982341 is about 280.1289414630.

The spelling of 21982341 in words is "twenty-one million, nine hundred eighty-two thousand, three hundred forty-one".