12445222421 has 4 divisors (see below), whose sum is σ = 12986319072. Its totient is φ = 11904125772.

The previous prime is 12445222417. The next prime is 12445222423. The reversal of 12445222421 is 12422254421.

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: 12422254421 = 43063 ⋅288467.

It is a cyclic number.

It is not a de Polignac number, because 12445222421 - 2² = 12445222417 is a prime.

It is a super-2 number, since 2×12445222421² (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 (12445222423) 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, 270548291 + ... + 270548336.

It is an arithmetic number, because the mean of its divisors is an integer number (3246579768).

Almost surely, 2^12445222421 is an apocalyptic number.

It is an amenable number.

12445222421 is a deficient number, since it is larger than the sum of its proper divisors (541096651).

12445222421 is an equidigital number, since it uses as much as digits as its factorization.

12445222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541096650.

The product of its digits is 10240, while the sum is 29.

Adding to 12445222421 its reverse (12422254421), we get a palindrome (24867476842).

The spelling of 12445222421 in words is "twelve billion, four hundred forty-five million, two hundred twenty-two thousand, four hundred twenty-one".