12102210021 has 16 divisors (see below), whose sum is σ = 17605090368. Its totient is φ = 7333891200.

The previous prime is 12102210017. The next prime is 12102210049. The reversal of 12102210021 is 12001220121.

It is not a de Polignac number, because 12102210021 - 2² = 12102210017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12102209979 and 12102210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102210011) 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, 505105 + ... + 528521.

It is an arithmetic number, because the mean of its divisors is an integer number (1100318148).

Almost surely, 2^12102210021 is an apocalyptic number.

12102210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12102210021 is a deficient number, since it is larger than the sum of its proper divisors (5502880347).

12102210021 is a wasteful number, since it uses less digits than its factorization.

12102210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39092.

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

Adding to 12102210021 its reverse (12001220121), we get a palindrome (24103430142).

The spelling of 12102210021 in words is "twelve billion, one hundred two million, two hundred ten thousand, twenty-one".