20121220221001 has 8 divisors (see below), whose sum is σ = 21180523835520. Its totient is φ = 19061945808912.

The previous prime is 20121220220987. The next prime is 20121220221013. The reversal of 20121220221001 is 10012202212102.

It is a happy number.

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 20121220221001 - 2⁹ = 20121220220489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121220221061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5879185 + ... + 8649118.

It is an arithmetic number, because the mean of its divisors is an integer number (2647565479440).

Almost surely, 2^{20121220221001} is an apocalyptic number.

It is an amenable number.

20121220221001 is a deficient number, since it is larger than the sum of its proper divisors (1059303614519).

20121220221001 is a wasteful number, since it uses less digits than its factorization.

20121220221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14601215.

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

Adding to 20121220221001 its reverse (10012202212102), we get a palindrome (30133422433103).

The spelling of 20121220221001 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one".