21982941 has 8 divisors (see below), whose sum is σ = 32567360. Its totient is φ = 14655276.

The previous prime is 21982931. The next prime is 21982951. The reversal of 21982941 is 14928912.

It is an interprime number because it is at equal distance from previous prime (21982931) and next prime (21982951).

It is not a de Polignac number, because 21982941 - 2¹⁹ = 21458653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21982896 and 21982905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407065 + ... + 407118.

It is an arithmetic number, because the mean of its divisors is an integer number (4070920).

Almost surely, 2^21982941 is an apocalyptic number.

It is an amenable number.

21982941 is a deficient number, since it is larger than the sum of its proper divisors (10584419).

21982941 is an equidigital number, since it uses as much as digits as its factorization.

21982941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814192 (or 814186 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21982941 is about 4688.5969116570. The cubic root of 21982941 is about 280.1314901123.

The spelling of 21982941 in words is "twenty-one million, nine hundred eighty-two thousand, nine hundred forty-one".