12421222221 has 8 divisors (see below), whose sum is σ = 16562284384. Its totient is φ = 8280487440.

The previous prime is 12421222213. The next prime is 12421222249. The reversal of 12421222221 is 12222212421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12421222221 - 2³ = 12421222213 is a prime.

It is a super-2 number, since 2×12421222221² (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 (12421222291) 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 7 ways as a sum of consecutive naturals, for example, 27591 + ... + 160011.

It is an arithmetic number, because the mean of its divisors is an integer number (2070285548).

Almost surely, 2^12421222221 is an apocalyptic number.

It is an amenable number.

12421222221 is a deficient number, since it is larger than the sum of its proper divisors (4141062163).

12421222221 is a wasteful number, since it uses less digits than its factorization.

12421222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163691.

The product of its digits is 512, while the sum is 21.

Adding to 12421222221 its reverse (12222212421), we get a palindrome (24643434642).

The spelling of 12421222221 in words is "twelve billion, four hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".