20000121221201 has 4 divisors (see below), whose sum is σ = 21818314059504. Its totient is φ = 18181928382900.

The previous prime is 20000121221191. The next prime is 20000121221233. The reversal of 20000121221201 is 10212212100002.

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 20000121221201 - 2⁴² = 15602074710097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20000121241201) 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, 909096419135 + ... + 909096419156.

It is an arithmetic number, because the mean of its divisors is an integer number (5454578514876).

Almost surely, 2^{20000121221201} is an apocalyptic number.

It is an amenable number.

20000121221201 is a deficient number, since it is larger than the sum of its proper divisors (1818192838303).

20000121221201 is a wasteful number, since it uses less digits than its factorization.

20000121221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818192838302.

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

Adding to 20000121221201 its reverse (10212212100002), we get a palindrome (30212333321203).

The spelling of 20000121221201 in words is "twenty trillion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred one".