20001002201121 has 16 divisors (see below), whose sum is σ = 27533126328320. Its totient is φ = 12901591809360.

The previous prime is 20001002201083. The next prime is 20001002201123. The reversal of 20001002201121 is 12110220010002.

It is not a de Polignac number, because 20001002201121 - 2¹⁸ = 20001001938977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001002201097 and 20001002201106.

It is not an unprimeable number, because it can be changed into a prime (20001002201123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18475705 + ... + 19528278.

It is an arithmetic number, because the mean of its divisors is an integer number (1720820395520).

Almost surely, 2^{20001002201121} is an apocalyptic number.

It is an amenable number.

20001002201121 is a deficient number, since it is larger than the sum of its proper divisors (7532124127199).

20001002201121 is a wasteful number, since it uses less digits than its factorization.

20001002201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38009676.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001002201121 its reverse (12110220010002), we get a palindrome (32111222211123).

The spelling of 20001002201121 in words is "twenty trillion, one billion, two million, two hundred one thousand, one hundred twenty-one".