12021010221 has 32 divisors (see below), whose sum is σ = 17817601536. Its totient is φ = 7147800000.

The previous prime is 12021010181. The next prime is 12021010241. The reversal of 12021010221 is 12201012021.

It is not a de Polignac number, because 12021010221 - 2⁹ = 12021009709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021010197 and 12021010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021010241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 544131 + ... + 565791.

It is an arithmetic number, because the mean of its divisors is an integer number (556800048).

Almost surely, 2^12021010221 is an apocalyptic number.

12021010221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021010221 is a deficient number, since it is larger than the sum of its proper divisors (5796591315).

12021010221 is a wasteful number, since it uses less digits than its factorization.

12021010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21993.

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

Adding to 12021010221 its reverse (12201012021), we get a palindrome (24222022242).

The spelling of 12021010221 in words is "twelve billion, twenty-one million, ten thousand, two hundred twenty-one".