20002101220121 has 8 divisors (see below), whose sum is σ = 20424103365864. Its totient is φ = 19584099095040.

The previous prime is 20002101220111. The next prime is 20002101220159. The reversal of 20002101220121 is 12102210120002.

It can be written as a sum of positive squares in 4 ways, for example, as 9297687722521 + 10704413497600 = 3049211^2 + 3271760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002101220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002101220096 and 20002101220105.

It is not an unprimeable number, because it can be changed into a prime (20002101220111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 999995060 + ... + 1000015061.

It is an arithmetic number, because the mean of its divisors is an integer number (2553012920733).

Almost surely, 2^{20002101220121} is an apocalyptic number.

It is an amenable number.

20002101220121 is a deficient number, since it is larger than the sum of its proper divisors (422002145743).

20002101220121 is a wasteful number, since it uses less digits than its factorization.

20002101220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000010331.

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

Adding to 20002101220121 its reverse (12102210120002), we get a palindrome (32104311340123).

The spelling of 20002101220121 in words is "twenty trillion, two billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".