12221311421 has 8 divisors (see below), whose sum is σ = 13372622688. Its totient is φ = 11076714000.

The previous prime is 12221311409. The next prime is 12221311429. The reversal of 12221311421 is 12411312221.

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

It is not a de Polignac number, because 12221311421 - 2⁶ = 12221311357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12221311393 and 12221311402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221311429) 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, 1674650 + ... + 1681931.

It is an arithmetic number, because the mean of its divisors is an integer number (1671577836).

Almost surely, 2^12221311421 is an apocalyptic number.

12221311421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221311421 is a deficient number, since it is larger than the sum of its proper divisors (1151311267).

12221311421 is a wasteful number, since it uses less digits than its factorization.

12221311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356923.

The product of its digits is 192, while the sum is 20.

Adding to 12221311421 its reverse (12411312221), we get a palindrome (24632623642).

The spelling of 12221311421 in words is "twelve billion, two hundred twenty-one million, three hundred eleven thousand, four hundred twenty-one".