21222417 has 8 divisors (see below), whose sum is σ = 28547424. Its totient is φ = 14022848.

The previous prime is 21222401. The next prime is 21222433. The reversal of 21222417 is 71422212.

It is an interprime number because it is at equal distance from previous prime (21222401) and next prime (21222433).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222417 - 2⁴ = 21222401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222393 and 21222402.

It is not an unprimeable number, because it can be changed into a prime (21220417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30963 + ... + 31640.

It is an arithmetic number, because the mean of its divisors is an integer number (3568428).

Almost surely, 2^21222417 is an apocalyptic number.

It is an amenable number.

21222417 is a deficient number, since it is larger than the sum of its proper divisors (7325007).

21222417 is a wasteful number, since it uses less digits than its factorization.

21222417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62719.

The product of its digits is 448, while the sum is 21.

The square root of 21222417 is about 4606.7794607513. The cubic root of 21222417 is about 276.8630175011.

Adding to 21222417 its reverse (71422212), we get a palindrome (92644629).

The spelling of 21222417 in words is "twenty-one million, two hundred twenty-two thousand, four hundred seventeen".