12021203213 has 4 divisors (see below), whose sum is σ = 12224952480. Its totient is φ = 11817453948.

The previous prime is 12021203203. The next prime is 12021203231. The reversal of 12021203213 is 31230212021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31230212021 = 2131 ⋅14655191.

It is a cyclic number.

It is not a de Polignac number, because 12021203213 - 2¹⁰ = 12021202189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021203191 and 12021203200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021203203) 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, 101874545 + ... + 101874662.

It is an arithmetic number, because the mean of its divisors is an integer number (3056238120).

Almost surely, 2^12021203213 is an apocalyptic number.

It is an amenable number.

12021203213 is a deficient number, since it is larger than the sum of its proper divisors (203749267).

12021203213 is an equidigital number, since it uses as much as digits as its factorization.

12021203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203749266.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 12021203213 its reverse (31230212021), we get a palindrome (43251415234).

The spelling of 12021203213 in words is "twelve billion, twenty-one million, two hundred three thousand, two hundred thirteen".