20001201012021 has 4 divisors (see below), whose sum is σ = 26668268016032. Its totient is φ = 13334134008012.

The previous prime is 20001201012011. The next prime is 20001201012029. The reversal of 20001201012021 is 12021010210002.

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 not a de Polignac number, because 20001201012021 - 2⁵ = 20001201011989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20001201011988 and 20001201012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201012029) 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, 3333533502001 + ... + 3333533502006.

It is an arithmetic number, because the mean of its divisors is an integer number (6667067004008).

Almost surely, 2^{20001201012021} is an apocalyptic number.

It is an amenable number.

20001201012021 is a deficient number, since it is larger than the sum of its proper divisors (6667067004011).

20001201012021 is an equidigital number, since it uses as much as digits as its factorization.

20001201012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667067004010.

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

Adding to 20001201012021 its reverse (12021010210002), we get a palindrome (32022211222023).

The spelling of 20001201012021 in words is "twenty trillion, one billion, two hundred one million, twelve thousand, twenty-one".