12122021213 has 4 divisors (see below), whose sum is σ = 12137005980. Its totient is φ = 12107036448.

The previous prime is 12122021209. The next prime is 12122021221. The reversal of 12122021213 is 31212022121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5547568324 + 6574452889 = 74482^2 + 81083^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122021213 - 2² = 12122021209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122021191 and 12122021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122021243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7491170 + ... + 7492787.

It is an arithmetic number, because the mean of its divisors is an integer number (3034251495).

Almost surely, 2^12122021213 is an apocalyptic number.

It is an amenable number.

12122021213 is a deficient number, since it is larger than the sum of its proper divisors (14984767).

12122021213 is an equidigital number, since it uses as much as digits as its factorization.

12122021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14984766.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12122021213 its reverse (31212022121), we get a palindrome (43334043334).

The spelling of 12122021213 in words is "twelve billion, one hundred twenty-two million, twenty-one thousand, two hundred thirteen".