12252021121 has 4 divisors (see below), whose sum is σ = 12254457600. Its totient is φ = 12249584644.

The previous prime is 12252021109. The next prime is 12252021157. The reversal of 12252021121 is 12112025221.

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 12252021121 - 2⁹ = 12252020609 is a prime.

It is a super-2 number, since 2×12252021121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12252021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210681 + ... + 1220758.

It is an arithmetic number, because the mean of its divisors is an integer number (3063614400).

Almost surely, 2^12252021121 is an apocalyptic number.

It is an amenable number.

12252021121 is a deficient number, since it is larger than the sum of its proper divisors (2436479).

12252021121 is an equidigital number, since it uses as much as digits as its factorization.

12252021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436478.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 12252021121 its reverse (12112025221), we get a palindrome (24364046342).

It can be divided in two parts, 122520 and 21121, that added together give a square (143641 = 379²).

The spelling of 12252021121 in words is "twelve billion, two hundred fifty-two million, twenty-one thousand, one hundred twenty-one".