21122366 has 8 divisors (see below), whose sum is σ = 31834344. Its totient is φ = 10510920.

The previous prime is 21122363. The next prime is 21122383. The reversal of 21122366 is 66322112.

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 (21122363) 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, 24605 + ... + 25448.

It is an arithmetic number, because the mean of its divisors is an integer number (3979293).

Almost surely, 2^21122366 is an apocalyptic number.

21122366 is a deficient number, since it is larger than the sum of its proper divisors (10711978).

21122366 is a wasteful number, since it uses less digits than its factorization.

21122366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50266.

The product of its digits is 864, while the sum is 23.

The square root of 21122366 is about 4595.9075273552. The cubic root of 21122366 is about 276.4272508235.

Adding to 21122366 its reverse (66322112), we get a palindrome (87444478).

The spelling of 21122366 in words is "twenty-one million, one hundred twenty-two thousand, three hundred sixty-six".