21422113 has 4 divisors (see below), whose sum is σ = 21455280. Its totient is φ = 21388948.

The previous prime is 21422099. The next prime is 21422117. The reversal of 21422113 is 31122412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21422113 - 2²¹ = 19324961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21422117) 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, 15595 + ... + 16912.

It is an arithmetic number, because the mean of its divisors is an integer number (5363820).

Almost surely, 2^21422113 is an apocalyptic number.

It is an amenable number.

21422113 is a deficient number, since it is larger than the sum of its proper divisors (33167).

21422113 is an equidigital number, since it uses as much as digits as its factorization.

21422113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33166.

The product of its digits is 96, while the sum is 16.

The square root of 21422113 is about 4628.4028562777. The cubic root of 21422113 is about 277.7287046763.

Adding to 21422113 its reverse (31122412), we get a palindrome (52544525).

The spelling of 21422113 in words is "twenty-one million, four hundred twenty-two thousand, one hundred thirteen".