12202121021 has 4 divisors (see below), whose sum is σ = 12214688544. Its totient is φ = 12189553500.

The previous prime is 12202120993. The next prime is 12202121077. The reversal of 12202121021 is 12012120221.

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: 12012120221 = 50077 ⋅239873.

It is a cyclic number.

It is not a de Polignac number, because 12202121021 - 2¹⁰ = 12202119997 is a prime.

It is a super-2 number, since 2×12202121021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12202120987 and 12202121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201121021) 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, 6282305 + ... + 6284246.

It is an arithmetic number, because the mean of its divisors is an integer number (3053672136).

Almost surely, 2^12202121021 is an apocalyptic number.

It is an amenable number.

12202121021 is a deficient number, since it is larger than the sum of its proper divisors (12567523).

12202121021 is an equidigital number, since it uses as much as digits as its factorization.

12202121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567522.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12202121021 its reverse (12012120221), we get a palindrome (24214241242).

The spelling of 12202121021 in words is "twelve billion, two hundred two million, one hundred twenty-one thousand, twenty-one".