21407366 has 8 divisors (see below), whose sum is σ = 32297184. Its totient is φ = 10641640.

The previous prime is 21407363. The next prime is 21407377. The reversal of 21407366 is 66370412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407363) by changing a digit.

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, 30590 + ... + 31281.

It is an arithmetic number, because the mean of its divisors is an integer number (4037148).

Almost surely, 2^21407366 is an apocalyptic number.

21407366 is a deficient number, since it is larger than the sum of its proper divisors (10889818).

21407366 is a wasteful number, since it uses less digits than its factorization.

21407366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62046.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 21407366 is about 4626.8094838668. The cubic root of 21407366 is about 277.6649604915.

Adding to 21407366 its reverse (66370412), we get a palindrome (87777778).

The spelling of 21407366 in words is "twenty-one million, four hundred seven thousand, three hundred sixty-six".