21220001065 has 8 divisors (see below), whose sum is σ = 25895594880. Its totient is φ = 16688271792.

The previous prime is 21220001039. The next prime is 21220001083. The reversal of 21220001065 is 56010002212.

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

It is a cyclic number.

It is not a de Polignac number, because 21220001065 - 2¹³ = 21219992873 is a prime.

It is a super-2 number, since 2×21220001065² (a number of 21 digits) contains 22 as substring.

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, 35965809 + ... + 35966398.

It is an arithmetic number, because the mean of its divisors is an integer number (3236949360).

Almost surely, 2^21220001065 is an apocalyptic number.

It is an amenable number.

21220001065 is a deficient number, since it is larger than the sum of its proper divisors (4675593815).

21220001065 is an equidigital number, since it uses as much as digits as its factorization.

21220001065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71932271.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21220001065 its reverse (56010002212), we get a palindrome (77230003277).

The spelling of 21220001065 in words is "twenty-one billion, two hundred twenty million, one thousand, sixty-five".