12221099965 has 8 divisors (see below), whose sum is σ = 14665917240. Its totient is φ = 9776481792.

The previous prime is 12221099911. The next prime is 12221099971. The reversal of 12221099965 is 56999012221.

It can be written as a sum of positive squares in 4 ways, for example, as 190081369 + 12031018596 = 13787^2 + 109686^2 .

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 12221099965 - 2²¹ = 12219002813 is a prime.

It is a congruent 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, 192321 + ... + 247849.

It is an arithmetic number, because the mean of its divisors is an integer number (1833239655).

Almost surely, 2^12221099965 is an apocalyptic number.

It is an amenable number.

12221099965 is a deficient number, since it is larger than the sum of its proper divisors (2444817275).

12221099965 is an equidigital number, since it uses as much as digits as its factorization.

12221099965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99551.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 12221099965 in words is "twelve billion, two hundred twenty-one million, ninety-nine thousand, nine hundred sixty-five".