12021403421 has 8 divisors (see below), whose sum is σ = 12047175360. Its totient is φ = 11995658752.

The previous prime is 12021403369. The next prime is 12021403441. The reversal of 12021403421 is 12430412021.

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

It is a cyclic number.

It is not a de Polignac number, because 12021403421 - 2³⁰ = 10947661597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021403393 and 12021403402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021403441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041146 + ... + 1052628.

It is an arithmetic number, because the mean of its divisors is an integer number (1505896920).

Almost surely, 2^12021403421 is an apocalyptic number.

It is an amenable number.

12021403421 is a deficient number, since it is larger than the sum of its proper divisors (25771939).

12021403421 is a wasteful number, since it uses less digits than its factorization.

12021403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13635.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12021403421 its reverse (12430412021), we get a palindrome (24451815442).

The spelling of 12021403421 in words is "twelve billion, twenty-one million, four hundred three thousand, four hundred twenty-one".