21422366 has 12 divisors (see below), whose sum is σ = 36753768. Its totient is φ = 9173592.

The previous prime is 21422347. The next prime is 21422381. The reversal of 21422366 is 66322412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16700 + ... + 17936.

It is an arithmetic number, because the mean of its divisors is an integer number (3062814).

Almost surely, 2^21422366 is an apocalyptic number.

21422366 is a deficient number, since it is larger than the sum of its proper divisors (15331402).

21422366 is an frugal number, since it uses more digits than its factorization.

21422366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483 (or 1246 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 21422366 is about 4628.4301874394. The cubic root of 21422366 is about 277.7297980183.

Adding to 21422366 its reverse (66322412), we get a palindrome (87744778).

The spelling of 21422366 in words is "twenty-one million, four hundred twenty-two thousand, three hundred sixty-six".