12220001212221 has 96 divisors (see below), whose sum is σ = 20467500318720. Its totient is φ = 6955217020800.

The previous prime is 12220001212207. The next prime is 12220001212253. The reversal of 12220001212221 is 12221210002221.

It is a happy number.

12220001212221 is a `hidden beast` number, since 12 + 220 + 0 + 0 + 1 + 212 + 221 = 666.

It is not a de Polignac number, because 12220001212221 - 2⁶ = 12220001212157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12220001212194 and 12220001212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220001214221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 43350310 + ... + 43631288.

It is an arithmetic number, because the mean of its divisors is an integer number (213203128320).

Almost surely, 2^{12220001212221} is an apocalyptic number.

12220001212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12220001212221 is a deficient number, since it is larger than the sum of its proper divisors (8247499106499).

12220001212221 is a wasteful number, since it uses less digits than its factorization.

12220001212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281447 (or 281444 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12220001212221 its reverse (12221210002221), we get a palindrome (24441211214442).

The spelling of 12220001212221 in words is "twelve trillion, two hundred twenty billion, one million, two hundred twelve thousand, two hundred twenty-one".