21441670 has 8 divisors (see below), whose sum is σ = 38595024. Its totient is φ = 8576664.

The previous prime is 21441661. The next prime is 21441689. The reversal of 21441670 is 7614412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072074 + ... + 1072093.

It is an arithmetic number, because the mean of its divisors is an integer number (4824378).

Almost surely, 2^21441670 is an apocalyptic number.

21441670 is a deficient number, since it is larger than the sum of its proper divisors (17153354).

21441670 is a wasteful number, since it uses less digits than its factorization.

21441670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144174.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21441670 is about 4630.5150901385. The cubic root of 21441670 is about 277.8131950692.

The spelling of 21441670 in words is "twenty-one million, four hundred forty-one thousand, six hundred seventy".