20021001001121 has 4 divisors (see below), whose sum is σ = 20360340001200. Its totient is φ = 19681662001044.

The previous prime is 20021001001117. The next prime is 20021001001129. The reversal of 20021001001121 is 12110010012002.

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 20021001001121 - 2² = 20021001001117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021001001129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169669499951 + ... + 169669500068.

It is an arithmetic number, because the mean of its divisors is an integer number (5090085000300).

Almost surely, 2^{20021001001121} is an apocalyptic number.

It is an amenable number.

20021001001121 is a deficient number, since it is larger than the sum of its proper divisors (339339000079).

20021001001121 is an equidigital number, since it uses as much as digits as its factorization.

20021001001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339339000078.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20021001001121 its reverse (12110010012002), we get a palindrome (32131011013123).

The spelling of 20021001001121 in words is "twenty trillion, twenty-one billion, one million, one thousand, one hundred twenty-one".