12020021213 has 4 divisors (see below), whose sum is σ = 12020331648. Its totient is φ = 12019710780.

The previous prime is 12020021203. The next prime is 12020021231. The reversal of 12020021213 is 31212002021.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 12020021213 - 2⁶ = 12020021149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020021203) 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, 87203 + ... + 177888.

It is an arithmetic number, because the mean of its divisors is an integer number (3005082912).

Almost surely, 2^12020021213 is an apocalyptic number.

It is an amenable number.

12020021213 is a deficient number, since it is larger than the sum of its proper divisors (310435).

12020021213 is an equidigital number, since it uses as much as digits as its factorization.

12020021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310434.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12020021213 its reverse (31212002021), we get a palindrome (43232023234).

The spelling of 12020021213 in words is "twelve billion, twenty million, twenty-one thousand, two hundred thirteen".