12021001212221 has 4 divisors (see below), whose sum is σ = 12022053574272. Its totient is φ = 12019948850172.

The previous prime is 12021001212211. The next prime is 12021001212271. The reversal of 12021001212221 is 12221210012021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12021001212221 - 2³⁸ = 11746123305277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021001212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021001212211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526163891 + ... + 526186736.

It is an arithmetic number, because the mean of its divisors is an integer number (3005513393568).

Almost surely, 2^{12021001212221} is an apocalyptic number.

It is an amenable number.

12021001212221 is a deficient number, since it is larger than the sum of its proper divisors (1052362051).

12021001212221 is a wasteful number, since it uses less digits than its factorization.

12021001212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052362050.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12021001212221 its reverse (12221210012021), we get a palindrome (24242211224242).

The spelling of 12021001212221 in words is "twelve trillion, twenty-one billion, one million, two hundred twelve thousand, two hundred twenty-one".