12120202021 has 4 divisors (see below), whose sum is σ = 12348885132. Its totient is φ = 11891518912.

The previous prime is 12120202019. The next prime is 12120202043. The reversal of 12120202021 is 12020202121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12020202121 = 17 ⋅707070713.

It can be written as a sum of positive squares in 2 ways, for example, as 11120757025 + 999444996 = 105455^2 + 31614^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120202021 - 2¹ = 12120202019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120201992 and 12120202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120202321) 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, 114341476 + ... + 114341581.

It is an arithmetic number, because the mean of its divisors is an integer number (3087221283).

Almost surely, 2^12120202021 is an apocalyptic number.

It is an amenable number.

12120202021 is a deficient number, since it is larger than the sum of its proper divisors (228683111).

12120202021 is an equidigital number, since it uses as much as digits as its factorization.

12120202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228683110.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12120202021 its reverse (12020202121), we get a palindrome (24140404142).

The spelling of 12120202021 in words is "twelve billion, one hundred twenty million, two hundred two thousand, twenty-one".