12211356521 has 8 divisors (see below), whose sum is σ = 15029361984. Its totient is φ = 9661732560.

The previous prime is 12211356503. The next prime is 12211356523. The reversal of 12211356521 is 12565311221.

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 12211356521 - 2¹⁴ = 12211340137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12211356523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67095275 + ... + 67095456.

It is an arithmetic number, because the mean of its divisors is an integer number (1878670248).

Almost surely, 2^12211356521 is an apocalyptic number.

It is an amenable number.

12211356521 is a deficient number, since it is larger than the sum of its proper divisors (2818005463).

12211356521 is a wasteful number, since it uses less digits than its factorization.

12211356521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134190751.

The product of its digits is 3600, while the sum is 29.

Adding to 12211356521 its reverse (12565311221), we get a palindrome (24776667742).

The spelling of 12211356521 in words is "twelve billion, two hundred eleven million, three hundred fifty-six thousand, five hundred twenty-one".