12021441421 has 16 divisors (see below), whose sum is σ = 13927006080. Its totient is φ = 10255150080.

The previous prime is 12021441409. The next prime is 12021441529. The reversal of 12021441421 is 12414412021.

It is a cyclic number.

It is not a de Polignac number, because 12021441421 - 2⁹ = 12021440909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021441392 and 12021441401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021421421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32361 + ... + 158398.

It is an arithmetic number, because the mean of its divisors is an integer number (870437880).

Almost surely, 2^12021441421 is an apocalyptic number.

12021441421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021441421 is a deficient number, since it is larger than the sum of its proper divisors (1905564659).

12021441421 is a wasteful number, since it uses less digits than its factorization.

12021441421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191124.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12021441421 its reverse (12414412021), we get a palindrome (24435853442).

The spelling of 12021441421 in words is "twelve billion, twenty-one million, four hundred forty-one thousand, four hundred twenty-one".