12201110021221 has 4 divisors (see below), whose sum is σ = 13310301841344. Its totient is φ = 11091918201100.

The previous prime is 12201110021143. The next prime is 12201110021227. The reversal of 12201110021221 is 12212001110221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-12201110021221 is a prime.

It is a super-2 number, since 2×12201110021221² (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 = 12201110021195 and 12201110021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201110021227) 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 3 ways as a sum of consecutive naturals, for example, 554595910045 + ... + 554595910066.

It is an arithmetic number, because the mean of its divisors is an integer number (3327575460336).

Almost surely, 2^{12201110021221} is an apocalyptic number.

12201110021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12201110021221 is a deficient number, since it is larger than the sum of its proper divisors (1109191820123).

12201110021221 is a wasteful number, since it uses less digits than its factorization.

12201110021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109191820122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12201110021221 its reverse (12212001110221), we get a palindrome (24413111131442).

The spelling of 12201110021221 in words is "twelve trillion, two hundred one billion, one hundred ten million, twenty-one thousand, two hundred twenty-one".