12211220121221 has 8 divisors (see below), whose sum is σ = 13751051397888. Its totient is φ = 10743008904000.

The previous prime is 12211220121151. The next prime is 12211220121281. The reversal of 12211220121221 is 12212102211221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211220121221 is a prime.

It is a super-2 number, since 2×12211220121221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211220121193 and 12211220121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211220121281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17905014500 + ... + 17905015181.

It is an arithmetic number, because the mean of its divisors is an integer number (1718881424736).

Almost surely, 2^{12211220121221} is an apocalyptic number.

12211220121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211220121221 is a deficient number, since it is larger than the sum of its proper divisors (1539831276667).

12211220121221 is a wasteful number, since it uses less digits than its factorization.

12211220121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35810029723.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12211220121221 its reverse (12212102211221), we get a palindrome (24423322332442).

Subtracting 12211220121221 from its reverse (12212102211221), we obtain a square (882090000 = 29700²).

The spelling of 12211220121221 in words is "twelve trillion, two hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".