21222065 has 8 divisors (see below), whose sum is σ = 25545408. Its totient is φ = 16925040.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222065 is 56022212.

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

It is not a de Polignac number, because 21222065 - 2¹² = 21217969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4757 + ... + 8066.

It is an arithmetic number, because the mean of its divisors is an integer number (3193176).

Almost surely, 2^21222065 is an apocalyptic number.

It is an amenable number.

21222065 is a deficient number, since it is larger than the sum of its proper divisors (4323343).

21222065 is a wasteful number, since it uses less digits than its factorization.

21222065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13159.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21222065 is about 4606.7412560290. The cubic root of 21222065 is about 276.8614867876.

Adding to 21222065 its reverse (56022212), we get a palindrome (77244277).

The spelling of 21222065 in words is "twenty-one million, two hundred twenty-two thousand, sixty-five".