20001201122021 has 4 divisors (see below), whose sum is σ = 22858515568032. Its totient is φ = 17143886676012.

The previous prime is 20001201121961. The next prime is 20001201122029. The reversal of 20001201122021 is 12022110210002.

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 a de Polignac number, because none of the positive numbers 2^k-20001201122021 is a prime.

It is a super-2 number, since 2×20001201122021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001201121987 and 20001201122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201122029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428657222995 + ... + 1428657223008.

It is an arithmetic number, because the mean of its divisors is an integer number (5714628892008).

Almost surely, 2^{20001201122021} is an apocalyptic number.

It is an amenable number.

20001201122021 is a deficient number, since it is larger than the sum of its proper divisors (2857314446011).

20001201122021 is an equidigital number, since it uses as much as digits as its factorization.

20001201122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857314446010.

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

Adding to 20001201122021 its reverse (12022110210002), we get a palindrome (32023311332023).

The spelling of 20001201122021 in words is "twenty trillion, one billion, two hundred one million, one hundred twenty-two thousand, twenty-one".