12212202211221 has 16 divisors (see below), whose sum is σ = 16290062395200. Its totient is φ = 8137905488640.

The previous prime is 12212202211193. The next prime is 12212202211289. The reversal of 12212202211221 is 12211220221221.

It is not a de Polignac number, because 12212202211221 - 2¹³ = 12212202203029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212202211021) 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, 153865255 + ... + 153944603.

It is an arithmetic number, because the mean of its divisors is an integer number (1018128899700).

Almost surely, 2^{12212202211221} is an apocalyptic number.

It is an amenable number.

12212202211221 is a deficient number, since it is larger than the sum of its proper divisors (4077860183979).

12212202211221 is a wasteful number, since it uses less digits than its factorization.

12212202211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101156.

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

Adding to 12212202211221 its reverse (12211220221221), we get a palindrome (24423422432442).

The spelling of 12212202211221 in words is "twelve trillion, two hundred twelve billion, two hundred two million, two hundred eleven thousand, two hundred twenty-one".