12012212212221 has 8 divisors (see below), whose sum is σ = 17248304715040. Its totient is φ = 7392130592112.

The previous prime is 12012212212159. The next prime is 12012212212223. The reversal of 12012212212221 is 12221221221021.

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

It is not a de Polignac number, because 12012212212221 - 2¹⁵ = 12012212179453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012212212223) 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, 154002720631 + ... + 154002720708.

It is an arithmetic number, because the mean of its divisors is an integer number (2156038089380).

Almost surely, 2^{12012212212221} is an apocalyptic number.

It is an amenable number.

12012212212221 is a deficient number, since it is larger than the sum of its proper divisors (5236092502819).

12012212212221 is a wasteful number, since it uses less digits than its factorization.

12012212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308005441355.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12012212212221 its reverse (12221221221021), we get a palindrome (24233433433242).

The spelling of 12012212212221 in words is "twelve trillion, twelve billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".