20002121101 has 4 divisors (see below), whose sum is σ = 20467286752. Its totient is φ = 19536955452.

The previous prime is 20002121071. The next prime is 20002121129. The reversal of 20002121101 is 10112120002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10112120002 = 2 ⋅5056060001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002121101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002121141) 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, 232582761 + ... + 232582846.

It is an arithmetic number, because the mean of its divisors is an integer number (5116821688).

Almost surely, 2^20002121101 is an apocalyptic number.

It is an amenable number.

20002121101 is a deficient number, since it is larger than the sum of its proper divisors (465165651).

20002121101 is an equidigital number, since it uses as much as digits as its factorization.

20002121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465165650.

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

Adding to 20002121101 its reverse (10112120002), we get a palindrome (30114241103).

It can be divided in two parts, 200021 and 21101, that added together give a palindrome (221122).

The spelling of 20002121101 in words is "twenty billion, two million, one hundred twenty-one thousand, one hundred one".