20001120101021 has 4 divisors (see below), whose sum is σ = 20027129360700. Its totient is φ = 19975110841344.

The previous prime is 20001120100999. The next prime is 20001120101029. The reversal of 20001120101021 is 12010102110002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10446560908996 + 9554559192025 = 3232114^2 + 3091045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001120101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001120100993 and 20001120101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001120101029) 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, 13004628686 + ... + 13004630223.

It is an arithmetic number, because the mean of its divisors is an integer number (5006782340175).

Almost surely, 2^{20001120101021} is an apocalyptic number.

It is an amenable number.

20001120101021 is a deficient number, since it is larger than the sum of its proper divisors (26009259679).

20001120101021 is an equidigital number, since it uses as much as digits as its factorization.

20001120101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26009259678.

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

Adding to 20001120101021 its reverse (12010102110002), we get a palindrome (32011222211023).

The spelling of 20001120101021 in words is "twenty trillion, one billion, one hundred twenty million, one hundred one thousand, twenty-one".