21301366 has 8 divisors (see below), whose sum is σ = 32080104. Its totient is φ = 10608000.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301366 is 66310312.

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 (21301361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20715 + ... + 21718.

It is an arithmetic number, because the mean of its divisors is an integer number (4010013).

Almost surely, 2^21301366 is an apocalyptic number.

21301366 is a deficient number, since it is larger than the sum of its proper divisors (10778738).

21301366 is a wasteful number, since it uses less digits than its factorization.

21301366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42686.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21301366 is about 4615.3402908128. The cubic root of 21301366 is about 277.2059097943.

Adding to 21301366 its reverse (66310312), we get a palindrome (87611678).

The spelling of 21301366 in words is "twenty-one million, three hundred one thousand, three hundred sixty-six".