20001112122001 has 4 divisors (see below), whose sum is σ = 20001164161392. Its totient is φ = 20001060082612.

The previous prime is 20001112121999. The next prime is 20001112122011. The reversal of 20001112122001 is 10022121110002.

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 20001112122001 - 2¹ = 20001112121999 is a prime.

It is a super-2 number, since 2×20001112122001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001112122011) 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, 25438855 + ... + 26213308.

It is an arithmetic number, because the mean of its divisors is an integer number (5000291040348).

Almost surely, 2^{20001112122001} is an apocalyptic number.

It is an amenable number.

20001112122001 is a deficient number, since it is larger than the sum of its proper divisors (52039391).

20001112122001 is an equidigital number, since it uses as much as digits as its factorization.

20001112122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52039390.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001112122001 its reverse (10022121110002), we get a palindrome (30023233232003).

The spelling of 20001112122001 in words is "twenty trillion, one billion, one hundred twelve million, one hundred twenty-two thousand, one".