21067222065 has 8 divisors (see below), whose sum is σ = 33707555328. Its totient is φ = 11235851760.

The previous prime is 21067222051. The next prime is 21067222081. The reversal of 21067222065 is 56022276012.

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

It is not a de Polignac number, because 21067222065 - 2⁷ = 21067221937 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702240721 + ... + 702240750.

It is an arithmetic number, because the mean of its divisors is an integer number (4213444416).

Almost surely, 2^21067222065 is an apocalyptic number.

It is an amenable number.

21067222065 is a deficient number, since it is larger than the sum of its proper divisors (12640333263).

21067222065 is a wasteful number, since it uses less digits than its factorization.

21067222065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404481479.

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 21067222065 its reverse (56022276012), we get a palindrome (77089498077).

The spelling of 21067222065 in words is "twenty-one billion, sixty-seven million, two hundred twenty-two thousand, sixty-five".