12211212222001 has 8 divisors (see below), whose sum is σ = 13150571333480. Its totient is φ = 11271858124032.

The previous prime is 12211212221933. The next prime is 12211212222113. The reversal of 12211212222001 is 10022221211221.

It can be written as a sum of positive squares in 4 ways, for example, as 92625879025 + 12118586342976 = 304345^2 + 3481176^2 .

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-12211212222001 is a prime.

It is a super-2 number, since 2×12211212222001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211212222001.

It is not an unprimeable number, because it can be changed into a prime (12211212225001) 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, 4938121 + ... + 6986233.

It is an arithmetic number, because the mean of its divisors is an integer number (1643821416685).

Almost surely, 2^{12211212222001} is an apocalyptic number.

It is an amenable number.

12211212222001 is a deficient number, since it is larger than the sum of its proper divisors (939359111479).

12211212222001 is a wasteful number, since it uses less digits than its factorization.

12211212222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506755.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12211212222001 its reverse (10022221211221), we get a palindrome (22233433433222).

The spelling of 12211212222001 in words is "twelve trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-two thousand, one".