20001000210121 has 4 divisors (see below), whose sum is σ = 22858285954432. Its totient is φ = 17143714465812.

The previous prime is 20001000210119. The next prime is 20001000210133. The reversal of 20001000210121 is 12101200010002.

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 20001000210121 - 2¹ = 20001000210119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001000210098 and 20001000210107.

It is not an unprimeable number, because it can be changed into a prime (20001003210121) 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, 1428642872145 + ... + 1428642872158.

It is an arithmetic number, because the mean of its divisors is an integer number (5714571488608).

Almost surely, 2^{20001000210121} is an apocalyptic number.

It is an amenable number.

20001000210121 is a deficient number, since it is larger than the sum of its proper divisors (2857285744311).

20001000210121 is an equidigital number, since it uses as much as digits as its factorization.

20001000210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857285744310.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001000210121 its reverse (12101200010002), we get a palindrome (32102200220123).

The spelling of 20001000210121 in words is "twenty trillion, one billion, two hundred ten thousand, one hundred twenty-one".