12001022012221 has 48 divisors (see below), whose sum is σ = 13804436016000. Its totient is φ = 10411921520000.

The previous prime is 12001022012209. The next prime is 12001022012251. The reversal of 12001022012221 is 12221022010021.

It is a happy number.

It is not a de Polignac number, because 12001022012221 - 2¹³ = 12001022004029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001022012195 and 12001022012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001022012251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 212262726 + ... + 212319256.

It is an arithmetic number, because the mean of its divisors is an integer number (287592417000).

Almost surely, 2^{12001022012221} is an apocalyptic number.

12001022012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001022012221 is a deficient number, since it is larger than the sum of its proper divisors (1803414003779).

12001022012221 is a wasteful number, since it uses less digits than its factorization.

12001022012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57282 (or 57271 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12001022012221 its reverse (12221022010021), we get a palindrome (24222044022242).

The spelling of 12001022012221 in words is "twelve trillion, one billion, twenty-two million, twelve thousand, two hundred twenty-one".