12021021221 has 8 divisors (see below), whose sum is σ = 13192369344. Its totient is φ = 10862761120.

The previous prime is 12021021203. The next prime is 12021021253. The reversal of 12021021221 is 12212012021.

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 12021021221 - 2¹⁰ = 12021020197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021021196 and 12021021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021026221) 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, 3270080 + ... + 3273753.

It is an arithmetic number, because the mean of its divisors is an integer number (1649046168).

Almost surely, 2^12021021221 is an apocalyptic number.

12021021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021021221 is a deficient number, since it is larger than the sum of its proper divisors (1171348123).

12021021221 is a wasteful number, since it uses less digits than its factorization.

12021021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544011.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12021021221 its reverse (12212012021), we get a palindrome (24233033242).

The spelling of 12021021221 in words is "twelve billion, twenty-one million, twenty-one thousand, two hundred twenty-one".