21344670 has 24 divisors (see below), whose sum is σ = 55496376. Its totient is φ = 5691888.

The previous prime is 21344669. The next prime is 21344677. The reversal of 21344670 is 7644312.

21344670 is a `hidden beast` number, since 213 + 446 + 7 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344677) 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 11 ways as a sum of consecutive naturals, for example, 118492 + ... + 118671.

It is an arithmetic number, because the mean of its divisors is an integer number (2312349).

Almost surely, 2^21344670 is an apocalyptic number.

21344670 is an abundant number, since it is smaller than the sum of its proper divisors (34151706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344670 is a wasteful number, since it uses less digits than its factorization.

21344670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237176 (or 237173 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21344670 is about 4620.0292206868. The cubic root of 21344670 is about 277.3936285759.

Adding to 21344670 its reverse (7644312), we get a palindrome (28988982).

The spelling of 21344670 in words is "twenty-one million, three hundred forty-four thousand, six hundred seventy".