12211211012221 has 16 divisors (see below), whose sum is σ = 13494481551936. Its totient is φ = 10978560907776.

The previous prime is 12211211012201. The next prime is 12211211012233. The reversal of 12211211012221 is 12221011211221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12211211012221 - 2⁷ = 12211211012093 is a prime.

It is a super-2 number, since 2×12211211012221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211211012201) 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, 30744235 + ... + 31138888.

It is an arithmetic number, because the mean of its divisors is an integer number (843405096996).

Almost surely, 2^{12211211012221} is an apocalyptic number.

It is an amenable number.

12211211012221 is a deficient number, since it is larger than the sum of its proper divisors (1283270539715).

12211211012221 is a wasteful number, since it uses less digits than its factorization.

12211211012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61883532.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12211211012221 its reverse (12221011211221), we get a palindrome (24432222223442).

The spelling of 12211211012221 in words is "twelve trillion, two hundred eleven billion, two hundred eleven million, twelve thousand, two hundred twenty-one".