12400022221 has 4 divisors (see below), whose sum is σ = 12401373600. Its totient is φ = 12398670844.

The previous prime is 12400022189. The next prime is 12400022237. The reversal of 12400022221 is 12222000421.

12400022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12400022221 - 2⁵ = 12400022189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12400022195 and 12400022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400022251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661831 + ... + 680308.

It is an arithmetic number, because the mean of its divisors is an integer number (3100343400).

Almost surely, 2^12400022221 is an apocalyptic number.

It is an amenable number.

12400022221 is a deficient number, since it is larger than the sum of its proper divisors (1351379).

12400022221 is an equidigital number, since it uses as much as digits as its factorization.

12400022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351378.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 12400022221 its reverse (12222000421), we get a palindrome (24622022642).

The spelling of 12400022221 in words is "twelve billion, four hundred million, twenty-two thousand, two hundred twenty-one".