12212222001221 has 16 divisors (see below), whose sum is σ = 13551123096000. Its totient is φ = 10913019024000.

The previous prime is 12212222001209. The next prime is 12212222001229. The reversal of 12212222001221 is 12210022221221.

It is a cyclic number.

It is not a de Polignac number, because 12212222001221 - 2⁶ = 12212222001157 is a prime.

It is a super-3 number, since 3×12212222001221³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212222001193 and 12212222001202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212222001229) 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, 39385496 + ... + 39694353.

It is an arithmetic number, because the mean of its divisors is an integer number (846945193500).

Almost surely, 2^{12212222001221} is an apocalyptic number.

12212222001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12212222001221 is a deficient number, since it is larger than the sum of its proper divisors (1338901094779).

12212222001221 is a wasteful number, since it uses less digits than its factorization.

12212222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79080100.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12212222001221 its reverse (12210022221221), we get a palindrome (24422244222442).

The spelling of 12212222001221 in words is "twelve trillion, two hundred twelve billion, two hundred twenty-two million, one thousand, two hundred twenty-one".