12421210021 has 8 divisors (see below), whose sum is σ = 14347494144. Its totient is φ = 10627773120.

The previous prime is 12421210003. The next prime is 12421210031. The reversal of 12421210021 is 12001212421.

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 12421210021 - 2⁹ = 12421209509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12421209977 and 12421210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421210031) 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, 33211605 + ... + 33211978.

It is an arithmetic number, because the mean of its divisors is an integer number (1793436768).

Almost surely, 2^12421210021 is an apocalyptic number.

12421210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12421210021 is a deficient number, since it is larger than the sum of its proper divisors (1926284123).

12421210021 is a wasteful number, since it uses less digits than its factorization.

12421210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66423611.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12421210021 its reverse (12001212421), we get a palindrome (24422422442).

The spelling of 12421210021 in words is "twelve billion, four hundred twenty-one million, two hundred ten thousand, twenty-one".