12162212121 has 4 divisors (see below), whose sum is σ = 16216282832. Its totient is φ = 8108141412.

The previous prime is 12162212119. The next prime is 12162212143. The reversal of 12162212121 is 12121226121.

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 12162212121 - 2¹ = 12162212119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12162212221) 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, 2027035351 + ... + 2027035356.

It is an arithmetic number, because the mean of its divisors is an integer number (4054070708).

Almost surely, 2^12162212121 is an apocalyptic number.

It is an amenable number.

12162212121 is a deficient number, since it is larger than the sum of its proper divisors (4054070711).

12162212121 is an equidigital number, since it uses as much as digits as its factorization.

12162212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054070710.

The product of its digits is 192, while the sum is 21.

Adding to 12162212121 its reverse (12121226121), we get a palindrome (24283438242).

The spelling of 12162212121 in words is "twelve billion, one hundred sixty-two million, two hundred twelve thousand, one hundred twenty-one".