20001002212121 has 4 divisors (see below), whose sum is σ = 22858288242432. Its totient is φ = 17143716181812.

The previous prime is 20001002212117. The next prime is 20001002212141. The reversal of 20001002212121 is 12121220010002.

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 20001002212121 - 2² = 20001002212117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001002212096 and 20001002212105.

It is not an unprimeable number, because it can be changed into a prime (20001002212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428643015145 + ... + 1428643015158.

It is an arithmetic number, because the mean of its divisors is an integer number (5714572060608).

Almost surely, 2^{20001002212121} is an apocalyptic number.

It is an amenable number.

20001002212121 is a deficient number, since it is larger than the sum of its proper divisors (2857286030311).

20001002212121 is an equidigital number, since it uses as much as digits as its factorization.

20001002212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857286030310.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20001002212121 its reverse (12121220010002), we get a palindrome (32122222222123).

The spelling of 20001002212121 in words is "twenty trillion, one billion, two million, two hundred twelve thousand, one hundred twenty-one".