12210120021 has 8 divisors (see below), whose sum is σ = 17760174624. Its totient is φ = 7400072720.

The previous prime is 12210120017. The next prime is 12210120031. The reversal of 12210120021 is 12002101221.

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 12210120021 - 2² = 12210120017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210119979 and 12210120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210120011) 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, 185001786 + ... + 185001851.

It is an arithmetic number, because the mean of its divisors is an integer number (2220021828).

Almost surely, 2^12210120021 is an apocalyptic number.

12210120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12210120021 is a deficient number, since it is larger than the sum of its proper divisors (5550054603).

12210120021 is a wasteful number, since it uses less digits than its factorization.

12210120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370003651.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12210120021 its reverse (12002101221), we get a palindrome (24212221242).

It can be divided in two parts, 122101200 and 21, that added together give a palindrome (122101221).

The spelling of 12210120021 in words is "twelve billion, two hundred ten million, one hundred twenty thousand, twenty-one".