12002452421 has 4 divisors (see below), whose sum is σ = 12708479052. Its totient is φ = 11296425792.

The previous prime is 12002452417. The next prime is 12002452433. The reversal of 12002452421 is 12425420021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12425420021 = 7 ⋅1775060003.

It can be written as a sum of positive squares in 2 ways, for example, as 10838892100 + 1163560321 = 104110^2 + 34111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002452421 - 2² = 12002452417 is a prime.

It is a super-2 number, since 2×12002452421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002452921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353013290 + ... + 353013323.

It is an arithmetic number, because the mean of its divisors is an integer number (3177119763).

Almost surely, 2^12002452421 is an apocalyptic number.

It is an amenable number.

12002452421 is a deficient number, since it is larger than the sum of its proper divisors (706026631).

12002452421 is an equidigital number, since it uses as much as digits as its factorization.

12002452421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706026630.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 12002452421 its reverse (12425420021), we get a palindrome (24427872442).

The spelling of 12002452421 in words is "twelve billion, two million, four hundred fifty-two thousand, four hundred twenty-one".