20201001200021 has 4 divisors (see below), whose sum is σ = 20204086742112. Its totient is φ = 20197915657932.

The previous prime is 20201001199963. The next prime is 20201001200027. The reversal of 20201001200021 is 12000210010202.

It is a happy number.

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 20201001200021 - 2³⁴ = 20183821330837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201001199975 and 20201001200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201001200027) 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, 1542761225 + ... + 1542774318.

It is an arithmetic number, because the mean of its divisors is an integer number (5051021685528).

Almost surely, 2^{20201001200021} is an apocalyptic number.

It is an amenable number.

20201001200021 is a deficient number, since it is larger than the sum of its proper divisors (3085542091).

20201001200021 is an equidigital number, since it uses as much as digits as its factorization.

20201001200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085542090.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20201001200021 its reverse (12000210010202), we get a palindrome (32201211210223).

The spelling of 20201001200021 in words is "twenty trillion, two hundred one billion, one million, two hundred thousand, twenty-one".