12221334647565 has 32 divisors (see below), whose sum is σ = 19829060582400. Its totient is φ = 6427042051584.

The previous prime is 12221334647531. The next prime is 12221334647597. The reversal of 12221334647565 is 56574643312221.

It is not a de Polignac number, because 12221334647565 - 2¹⁰ = 12221334646541 is a prime.

It is a super-2 number, since 2×12221334647565² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19650589 + ... + 20262978.

It is an arithmetic number, because the mean of its divisors is an integer number (619658143200).

Almost surely, 2^{12221334647565} is an apocalyptic number.

12221334647565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12221334647565 is a deficient number, since it is larger than the sum of its proper divisors (7607725934835).

12221334647565 is a wasteful number, since it uses less digits than its factorization.

12221334647565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39913861.

The product of its digits is 7257600, while the sum is 51.

Adding to 12221334647565 its reverse (56574643312221), we get a palindrome (68795977959786).

The spelling of 12221334647565 in words is "twelve trillion, two hundred twenty-one billion, three hundred thirty-four million, six hundred forty-seven thousand, five hundred sixty-five".