12221115535 has 16 divisors (see below), whose sum is σ = 14856652800. Its totient is φ = 9649444896.

The previous prime is 12221115463. The next prime is 12221115539. The reversal of 12221115535 is 53551112221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12221115535 - 2²⁷ = 12086897807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221115539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539306 + ... + 1547224.

It is an arithmetic number, because the mean of its divisors is an integer number (928540800).

Almost surely, 2^12221115535 is an apocalyptic number.

12221115535 is a deficient number, since it is larger than the sum of its proper divisors (2635537265).

12221115535 is an equidigital number, since it uses as much as digits as its factorization.

12221115535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11910.

The product of its digits is 3000, while the sum is 28.

Adding to 12221115535 its reverse (53551112221), we get a palindrome (65772227756).

The spelling of 12221115535 in words is "twelve billion, two hundred twenty-one million, one hundred fifteen thousand, five hundred thirty-five".