12212202212121 has 4 divisors (see below), whose sum is σ = 16282936282832. Its totient is φ = 8141468141412.

The previous prime is 12212202212059. The next prime is 12212202212149. The reversal of 12212202212121 is 12121220221221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12212202212121 - 2⁶ = 12212202212057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212202912121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2035367035351 + ... + 2035367035356.

It is an arithmetic number, because the mean of its divisors is an integer number (4070734070708).

Almost surely, 2^{12212202212121} is an apocalyptic number.

It is an amenable number.

12212202212121 is a deficient number, since it is larger than the sum of its proper divisors (4070734070711).

12212202212121 is an equidigital number, since it uses as much as digits as its factorization.

12212202212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070734070710.

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

Adding to 12212202212121 its reverse (12121220221221), we get a palindrome (24333422433342).

The spelling of 12212202212121 in words is "twelve trillion, two hundred twelve billion, two hundred two million, two hundred twelve thousand, one hundred twenty-one".