21422213 has 16 divisors (see below), whose sum is σ = 23284800. Its totient is φ = 19662720.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422213 is 31222412.

It is a cyclic number.

It is not a de Polignac number, because 21422213 - 2¹⁴ = 21405829 is a prime.

It is a super-2 number, since 2×21422213² = 917822419634738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21422191 and 21422200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50918 + ... + 51336.

It is an arithmetic number, because the mean of its divisors is an integer number (1455300).

Almost surely, 2^21422213 is an apocalyptic number.

It is an amenable number.

21422213 is a deficient number, since it is larger than the sum of its proper divisors (1862587).

21422213 is a wasteful number, since it uses less digits than its factorization.

21422213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532.

The product of its digits is 192, while the sum is 17.

The square root of 21422213 is about 4628.4136591277. The cubic root of 21422213 is about 277.7291368283.

Adding to 21422213 its reverse (31222412), we get a palindrome (52644625).

The spelling of 21422213 in words is "twenty-one million, four hundred twenty-two thousand, two hundred thirteen".