21441970 has 32 divisors (see below), whose sum is σ = 42296256. Its totient is φ = 7761600.

The previous prime is 21441967. The next prime is 21441989. The reversal of 21441970 is 7914412.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 43425 + ... + 43915.

It is an arithmetic number, because the mean of its divisors is an integer number (1321758).

Almost surely, 2^21441970 is an apocalyptic number.

21441970 is a deficient number, since it is larger than the sum of its proper divisors (20854286).

21441970 is a wasteful number, since it uses less digits than its factorization.

21441970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21441970 is about 4630.5474838295. The cubic root of 21441970 is about 277.8144907327.

It can be divided in two parts, 2144 and 1970, that added together give a palindrome (4114).

The spelling of 21441970 in words is "twenty-one million, four hundred forty-one thousand, nine hundred seventy".